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Page 2 Copyright © 2015 YEALINK NETWORK TECHNOLOGY Copyright © 2015 Yealink Network Technology CO., LTD. All rights reserved. No parts of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, photocopying, recording, or otherwise, for any purpose, without the express written permission of Yealink Network Technology CO., LTD.
Page 3 Do not dispose of WEEE as unsorted municipal waste and have to collect such WEEE separately. We are striving to improve our documentation quality and we appreciate your feedback. Email your opinions and comments to DocsFeedback@yealink.com.
Page 4 Yealink IP phone firmware contains third-party software under the GNU General Public License (GPL). Yealink uses software under the specific terms of the GPL. Please refer to the GPL for the exact terms and conditions of the license. The original GPL license, source code of components licensed under GPL and used in Yealink products can be downloaded from Yealink web site: http://www.yealink.com/GPLOpenSource.aspx?BaseInfoCateId=293&NewsCateId=293&CateId=293.
Page 5: About This Guide
About This Guide This guide is intended for administrators who need to properly deploy Yealink IP phones with Lync Server. It provides details on the functionality and configuration of IP phones. Many of the features described in this guide involve network settings, which could affect the IP phone’s performance in the network.
Page 6 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Chapter 6, “Configuring Security Features” describes how to configure the security  features on IP phones. Chapter 7, “Troubleshooting” describes how to troubleshoot IP phones and  provides some common troubleshooting solutions. Chapter 8, “Appendix”...
Page 7: Table Of Contents
Table of Contents About This Guide ..............v Documentations ..........................v In This Guide ............................ v Summary of Changes ........................vi Changes for Release 70, Guide Version 70.50 ..............vi Table of Contents ..............vii Product Overview ..............1 VoIP Principle ............................ 1 SIP Components..........................
Page 8 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Upgrading Firmware ........................51 Upgrading Firmware via Web User Interface ..............52 Upgrading Firmware from the Provisioning Server ............52 Updating Phone Firmware from Microsoft Lync Server............57 Configuring Basic Features ............ 61 Power Indicator LED ........................
Page 9: Table Of Contents
Table of Contents E911 Location Tip ......................... 145 Boss/Admin Light ......................... 146 BToE ............................... 148 Configuring Advanced Features...........151 VLAN ............................. 151 LLDP ............................151 CDP ............................153 Manual Configuration for VLAN ..................155 DHCP VLAN ........................... 160 Voice Quality Monitoring ......................162 Quality of Service ........................
Page 10 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Viewing Log Files ........................237 Capturing Packets ........................ 241 Enabling Watch Dog Feature ....................244 Getting Information from Status Indicators ................ 245 Analyzing Configuration File ....................246 Troubleshooting Solutions ......................247 Why is the LCD screen blank? .....................
Page 11 Table of Contents Call Transfer with Consultation .................... 285 Always Call Forward ......................290 Busy Call Forward ........................ 293 No Answer Call Forward ..................... 297 Call Conference ........................300 Index ..................305...
Page 12 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones...
Page 13: Product Overview
Product Overview This chapter contains the following information about IP phones: VoIP Principle  SIP Components  SIP IP Phone Models  VoIP VoIP (Voice over Internet Protocol) is a technology using the Internet Protocol instead of traditional Public Switch Telephone Network (PSTN) technology for voice communications.
Page 14 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones SIP provides capabilities to: Determine the location of the target endpoint -- SIP supports address resolution,  name mapping, and call redirection. Determine media capabilities of the target endpoint -- Via Session Description ...
Page 15  SIP-T22(P)  For a list of key features available on Yealink IP phones running the latest firmware, refer Key Features of IP Phones on page 6. In order to operate as SIP endpoints in your network successfully, IP phones must meet the following requirements: A working IP network is established.
Page 16: Physical Features Of Ip Phones
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones SIP-T48G Physical Features: 7” 800 x 480 pixel color touch screen with backlight 24 bit depth color 1 VoIP account, Microsoft Lync Compatible ® HD Voice: HD Codec, HD Handset, HD Speaker...
Page 17 Product Overview SIP-T22(P) Physical Features: TI TITAN chipset and TI voice engine 132 x 64 graphic LCD 1 VoIP account, Microsoft Lync Compatible ® HD Voice: HD Codec, HD Handset, HD Speaker 32 keys including 4 soft keys 1*RJ9 (4P4C) handset port 1*RJ9 (4P4C) headset port 2*RJ45 10/100Mbps Ethernet ports 5 LEDs: 1*power, 3*line, 1*message...
Page 18 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones In addition to physical features introduced above, IP phones also support the following key features when running the latest firmware: Phone Features  Call Options: call waiting, call hold, call mute, call forward, call transfer. Basic Features: DND, live dialpad, dial plan, caller identity, auto answer.
Page 19 Product Overview Admin/User configuration mode 802.1X authentication...
Page 20 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones...
Page 21: Getting Started
Configuring Basic Network Parameters  Upgrading Firmware  This section introduces how to install SIP-T48G and T22(P) IP phones with components in packaging contents. Attach the stand and the optional wall mount bracket Connect the handset and optional headset Connect the network and power Note A headset, wall mount bracket are not included in packaging contents.
Page 22 Attach the stand and the optional wall mount bracket: For SIP-T48G: Desk Mount Method Wall Mount Method (Optional) Note The top two slots on SIP-T48G IP phones are plugged up by silica gel. You need to pull out silica gel before attaching the wall mount bracket.
Page 23 For SIP-T22(P): Desk Mount Method Wall Mount Method (Optional) Note For more information on how to mount the IP phone to a wall, refer to Yealink Wall Mount Quick Installation Guide. Connect the handset and optional headset: For SIP-T48G: Note The headset and wireless headset adapter EHS36 should be purchased separately.
Page 24 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Connect the network and power: AC power (Optional)  Power over Ethernet (PoE)  Note PoE is not applicable to the SIP-T22 IP phones. AC Power (Optional) To connect the AC power and network: Connect the DC plug of the power adapter to the DC5V port on the IP phone and connect the other end of the power adapter into an electrical power outlet.
Page 25 Connect the Ethernet cable between the Internet port on the IP phone and an available port on the in-line power switch/hub. For SIP-T48G/T22P IP phones: Note If in-line power switch/hub is provided, you don’t need to connect the phone to the power adapter.
Page 26 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Querying the DHCP (Dynamic Host Configuration Protocol) Server The IP phone is capable of querying a DHCP server. DHCP is enabled on the IP phone by default. The following network parameters can be obtained from the DHCP server during initialization: IP Address ...
Page 27 Getting Started phone starts up. The main LCD screen displays the following: Time and date  Soft key labels  Press the OK key to check the IP phone status, the LCD screen displays the valid IP address, MAC address, firmware version, etc. If the IP phone has successfully passed through these steps, it starts up properly and is ready for use.
Page 28 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones T48G T22(P) Description Received Calls Placed Calls Missed Calls Return to previous screen Receive a call Make a call Handset mode Headset mode Hands-free speakerphone mode Multi-lingual lowercase letters input mode Multi-lingual uppercase letters input mode...
Page 29: Phone User Interface
Access to specific features is restricted to the administrator. The default password is “admin“(case-sensitive). Not all features are available on phone user interface. For more information, refer to Yealink phone-specific user guide, available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142. An administrator or a user can configure IP phones via web user interface. The default user name and password for the administrator to log into the web user interface are both “admin”...
Page 30: Configuration Files
This entire process is called auto provisioning. For more information on auto provisioning, refer to Yealink IP Phones Auto Provisioning Guide, available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Page 31 Language Packs 0.GUI.English.lang, lang+English.txt Resource Files DST Template AutoDST.xml You can ask the distributor or Yealink FAE for template files. You can also obtain the template files online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142. To download template files: Go to Yealink Document Download Page and select the desired phone model (e.g., SIP-T22) under the Documents and Downloads tab.
Page 32: Provisioning Server
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones For some features, you can customize the filename as required. The following table lists the special characters supported by Yealink IP phones: Server HTTP/HTTPS TFTP/FTP Platform Support: ~ ` ! @ $ ^ ( ) Support: ~ ` ! @ $ ^ ( ) _ - , .
Page 33: Deploying Phones From The Provisioning Server
The provisioning server can be on the local LAN or anywhere on the Internet. Use the following procedure as a recommendation if this is your first provisioning server setup. For more information on how to set up a provisioning server, refer to Yealink IP Phones Auto Provisioning Guide, available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Page 34 Static: You can manually configure the server address via phone user interface or  web user interface. For more information on the above methods, refer to Yealink IP Phones Auto Provisioning Guide, available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142. In order to get your IP phones running, you must perform basic network setup, such as IP address and subnet mask configuration.
Page 35: Dhcp
Getting Started DHCP (Dynamic Host Configuration Protocol) is a network protocol used to dynamically allocate network parameters to network hosts. The automatic allocation of network parameters to hosts eases the administrative burden of maintaining an IP network. IP phones comply with the DHCP specifications documented in RFC 2131. If using DHCP , IP phones connected to the network become operational without having to be manually assigned IP addresses and additional network parameters.
Page 36 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Port->IPv4 To configure DHCP via web user interface: Click on Network->Basic. In the IPv4 Config block, mark the DHCP radio box. Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot.
Page 37 Getting Started ?p=network&q=load Configure the static DNS feature. Phone User Interface Configure static DNS address. Details of Configuration Parameters: Parameters Permitted Values Default network.static_dns_enable 0 or1 Description: Triggers the static DNS feature to on or off. 0-Off 1-On If it is set to 0 (Off), the IP phone will use the IPv4 DNS obtained from DHCP . If it is set to 1 (On), the IP phone will use manually configured static IPv4 DNS.
Page 38 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default network.secondary_dns IPv4 Address Blank Description: Configures the secondary IPv4 DNS server. Example: network.secondary_dns = 202.101.103.54 Note: It works only if the value of the parameter “network.static_dns_enable” is set to 1 (On).
Page 39 Getting Started To configure static DNS when DHCP is used via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->DNS Server. Press , or the Switch soft key to select Enable from the Static DNS field. Enter the desired values in the Pri DNS and Sec DNS fields respectively. Press the Save soft key to accept the change.
Page 40 Connecting to the secondary DHCP server that responds to DHCP INFORM queries with a requested provisioning server address is one possibility. For more information, refer to http://www.ietf.org/rfc/rfc3925.txt?number=3925. The following shows the common options when deploying Yealink IP phones with Microsoft ® Lync server.
Page 41: Dhcp Option 60
Getting Started vendor class ID it is configured for, the option 43 might have different values. Two vendor class identifiers are used when deploying with the Lync server: a VLAN ID request (vendor class ID: CPE-OCPHONE) and a certificate provisioning service URL request (vendor class ID: MS-UC-Client).
Page 42 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Mark the On radio box in the DHCP Active field. Click Confirm to accept the change. DHCP option 60 is used to identify the vendor class ID. By default, the vendor class ID is MS-UC-Client (case-sensitive).
Page 43 Enter the desired host name in the DHCP Option Value filed. Click Confirm to accept the change. Yealink IP phones support using the NTP server address offered by DHCP . DHCP option 42 is used to specify a list of NTP servers available to the client by IP address.
Page 44 Description: Configures the DHCP option 12 hostname on the IP phone. For SIP-T48G IP phones: The default value is SIP-T48G. For SIP-T22(P) IP phones: The default value is SIP-T22P . Note: If you change this parameter, the IP phone will reboot to make the change take effect.
Page 45 A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone. Yealink IP phones support obtaining Lync server address from DHCP . DHCP option 120 is used to specify a list of Lync servers available to the client.
Page 46 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of Configuration Parameters: Parameters Permitted Values Default sip.option120_get_lync_server.enable 0 or 1 Description: Enables or disables the IP phones to obtain the Lync server address from DHCP by detecting DHCP option 120. 0-Disabled 1-Enabled Web User Interface:...
Page 47 Getting Started server, you need to configure them manually. The following parameters should be configured for IP phones to establish network connectivity: IP Address  Subnet Mask  Default Gateway  Primary DNS  Secondary DNS  Procedure Network parameters can be configured manually using the configuration files or locally. Configure network parameters of the IP phone manually.
Page 48 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Note: It works only if the value of the parameter “network.ip_address_mode” is set to 0 (IPv4) or 2 (IPv4 & IPv6). If you change this parameter, the IP phone will reboot to make the change take effect.
Page 49 Getting Started Parameters Permitted Values Default Port->IPv4->Static IP Client->IPv4 network.internet_port.mask Subnet Mask Blank Description: Configures the IPv4 subnet mask. Example: network.internet_port.mask = 255.255.255.0 Note: It works only if the value of the parameter “network.ip_address_mode” is set to 0 (IPv4) or 2 (IPv4 & IPv6), and "network.internet_port.type" is set to 2 (Static IP Address).
Page 50 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Description: Configures the primary IPv4 DNS server. Example: network.primary_dns = 202.101.103.55 Note: It works only if the value of the parameter “network.ip_address_mode” is set to 0 (IPv4) or 2 (IPv4 &...
Page 51 Getting Started Select desired value from the pull-down list of Mode(IPv4/IPv6). Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone. To configure a static IPv4 address via web user interface: Click on Network->Basic.
Page 52: Pppoe
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones To configure the IP address mode via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port. Press to select IPv4 or IPv4 & IPv6 from the IP Mode field. Press the Save soft key to accept the change.
Page 53 Getting Started password for PPPoE on the IP phone. Navigate to: http://<phoneIPAddress>/servlet ?p=network&q=load Configure PPPoE on the IP phone. Configure the user name and Phone User Interface password for PPPoE on the IP phone. Details of Configuration Parameters: Parameters Permitted Values Default network.internet_port.type 0, 1 or 2...
Page 54 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Network->Basic->IPv4 Config->PPPoE->User Name Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port->IPv4->PPPoE IP Client->PPPoE User String within 99 network.pppoe.password Blank characters Description: Configures the password for PPPoE connection. Example: network.pppoe.password = yealink123 Note: It works only if the value of the parameter “network.ip_address_mode”...
Page 55 Getting Started Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone. To configure PPPoE via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port->IPv4->PPPoE IP Client.
Page 56 Internet port and PC port for the IP phone to transmit in 10Mbps, 100Mbps or 1000Mbps (1000Mbps is only applicable to SIP-T48G IP phones). Procedure The transmission methods of Ethernet ports can be configured using the configuration files or locally.
Page 57 3-Half Duplex 10Mbps 4-Half Duplex 100Mbps 5-Full Duplex 1000Mbps (only applicable to SIP-T48G IP phones) Note: We recommend that you do not change this parameter. If you change this parameter, the IP phone will reboot to make the change take effect.
Page 58 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Advanced->Port Link->PC Port Link Phone User Interface: None To configure the transmission methods of Ethernet ports via web user interface: Click on Network->Advanced.
Page 59 Getting Started Parameter: network.bridge_mode Configure network parameters of the PC port. Parameter: network.pc_port.ip network.pc_port.mask network.pc_port.dhcp_server network.dhcp.start_ip network.dhcp.end_ip Configure the PC port mode. Configure the PC (LAN) port type. Configure network parameters of Local Web User Interface the PC port. Navigate to: http://<phoneIPAddress>/servlet ?p=network-pcport&q=load Details of Configuration Parameters:...
Page 60 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default 0-As Router 1-As Bridge Note: It works only if the value of the parameter “network.pc_port.enable” is set to 1 (Auto Negotiation). If you change this parameter, the IP phone will reboot to make the change take effect.
Page 61 Getting Started Parameters Permitted Values Default Description: Enables or disables the IP phone to act as a DHCP server. 0-Disabled 1-Enabled Note: It works only if the value of the parameter “network.pc_port.enable“ is set to 1 (Auto Negotiation) and “network.bridge_mode” is set to 0 (As Router). If you change this parameter, the IP phone will reboot to make the change take effect.
Page 62 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Phone User Interface: None To enable the PC port via web user interface: Click on Network->PC Port. Select Auto Negotiation from the pull-down list of PC Port Active. Click Confirm to accept the change.
Page 63: Upgrading Firmware
 The following table lists the associated and latest firmware name for each IP phone model (X is replaced by the actual firmware version). IP Phone Model Associated Firmware Name Firmware Name Example SIP-T48G 35.x.x.x.rom 35.7.0.50.rom SIP-T22(P) 7.x.x.x.rom 7.7.0.50.rom Note You can download the latest firmware online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Page 64: Upgrading Firmware Via Web User Interface
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones To manually upgrade firmware via web user interface, you need to store firmware to your local system in advance. To upgrade firmware manually via web user interface: Click on Settings->Upgrade. Click Browse to locate the required firmware from your local system.
Page 65 Getting Started Procedure Configuration changes can be performed using the configuration files or locally. Configure the way for the IP phone to check for configuration files. Parameters: auto_provision.power_on auto_provision.repeat.enable auto_provision.repeat.minutes Configuration auto_provision.weekly.enable <y0000000000xx>.cfg File auto_provision.weekly.begin_time auto_provision.weekly.end_time auto_provision.weekly.dayofweek Specify the access URL of firmware. Parameter: firmware.url Configure the way for the IP phone to...
Page 66 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default auto_provision.repeat.enable 0 or 1 Description: Triggers the repeatedly feature to on or off. 0-Off 1-On If it is set to 1 (On), the IP phone will perform an auto provisioning process repeatedly.
Page 67 Getting Started Parameters Permitted Values Default auto_provision.weekly.begin_time Time from 00:00 to 23:59 00:00 Description: Configures the begin time of the day for the IP phone to perform an auto provisioning process weekly. Note: It works only if the value of the parameter “auto_provision.weekly.enable” is set to 1 (On).
Page 68 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default auto_provision.weekly.dayofweek = 01 It means the IP phone will perform an auto provisioning process every Sunday and Monday. Note: It works only if the value of the parameter “auto_provision.weekly.enable” is set to 1 (On).
Page 69 When the “Power On” is set to On, the IP phone will check configuration files stored on the provisioning server during startup and then will download firmware from the server. You can update firmware of Yealink SIP-T48G/T22(P) Lync phones from Lync server. There are two ways to update firmware from Lync server: Automatic Update ...
Page 70 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Reboot When the phone connects to the network and is powered on, it automatically checks if an update is available on Lync server, regardless of whether a Lync user signs on the phone.
Page 71 Getting Started http://<phoneIPAddress>/servlet?p=fe atures-general&q=load Details of Configuration Parameters: Parameters Permitted Values Default Integer from 1 to features.update_checking_time Description: Configures the interval (in hours) for the IP phone to automatically check if there is a firmare update available on Lync server. If it is set to 1 (1 hour), the IP phone will check if a firmware update is available on the Lync server every 1 hour.
Page 72 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones A dialog box pops up to prompt that settings will take effect after a reboot. Click Confirm to accept the change. You can initiate an update immediately, just power off the phone and power on it again. The phone will boot up, check for updates and apply the updates.
Page 73: E911 Location Tip
Configuring Basic Features This chapter provides information for making configuration changes for the following basic features: Power Indicator LED  Backlight  Sign-in  Web Server Type  Time and Date  Language  Logo Customization  Key as send ...
Page 74: Btoe
BToE  Power indicator LED indicates power status and phone status. This feature is only applicable to SIP-T48G IP phones. There are six configuration options for power indicator LED: Common Power Light On Common Power Light On allows the power indicator LED to be turned on.
Page 75 Configuring Basic Features h_enable phone_setting.hold_and_held_power _led_flash_enable phone_setting.talk_and_dial_power_ led_enable Configure the power indicator LED. Navigate to: Local Web User Interface http://<phoneIPAddress>/servlet?p= features-powerled&q=load Details of Configuration Parameters: Permitted Parameters Default Values phone_setting.common_power_led_enable 0 or 1 Description: Enables or disables the power indicator LED to be turned on. 0-Disabled (power indicator LED is off) 1-Enabled (power indicator LED is solid red) Web User Interface:...
Page 76 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Permitted Parameters Default Values Enables or disables the power indicator LED to flash when the IP phone receives a voice mail. 0-Disabled (power indicator LED does not flash) 1-Enabled (power indicator LED slow flashes (1000ms) red) Web User Interface: Features->Power LED->Voice/Text Mail Power Light Flash Phone User Interface:...
Page 77: Backlight
Backlight turns off quickly if a intensity of the LCD screen when the IP phone is inactive. short backlight time is configured, this may not give users enough time to read messages. Backlight time is applicable to SIP-T48G/T22(P) IP phones.
Page 78 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones You can configure the backlight time as one of the following types: Always Off: Backlight is turned off permanently (not applicable to SIP-T48G IP  phones). Always On: Backlight is turned on permanently.
Page 79 Integer from 1 to 10 Description: Configures the intensity of the LCD screen when the phone is active. 10 is the highest intensity. Note: It is only applicable to SIP-T48G IP phones. Web User Interface: Settings->Preference->Backlight Active Level Phone User Interface: Menu->Basic->Display->Backlight->Backlight Active Level...
Page 80 120-120s If it is set to 60 (60s), the intensity of the LCD screen will be changed when the IP phone has been inactive for 60 seconds. For SIP-T48G: The default value is 0. For T22(P): The default value is 30.
Page 81: Sign-In
Backlight Time field. Press the Save soft key to accept the change. To configure the backlight via web user interface (take SIP-T48G IP phones for example): Click on Settings->Preference. Select the desired value from the pull-down list of Backlight Inactive Level.
Page 82 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones personal identification number (PIN) to sign in to Lync server. It is only available on the phone user interface. Procedure Sign-in can be configured using the configuration files or locally. Configure User Credentials method.
Page 83 Configuring Basic Features Parameters Permitted Values Default Account->Register->Login address Phone User Interface: For SIP-T48G: User Sign in->Sign-in Address For SIP-T22(P): Sign in->User Credentials->Sign-in address String within 128 account.sign_in.user_name Blank characters Description: Configures the user name for the User Credentials (User Sign in) method.
Page 84 Configures the PIN for the PIN Authentication (Pin Sign in) method. Web User Interface: None Phone User Interface: For SIP-T48G: Pin Sign in->Pin For SIP-T22(P): Sign in->PIN Authentication->PIN To configure User Credentials method via web user interface: Click on Account->Register.
Page 85: Web Server Type
Enter the desired password in the Password field. Tap the Sign in soft key. To sign in to Lync server with the PIN Authentication method via phone user interface (take SIP-T48G IP phones for example): Tap PIN Sign in. Enter the desired extension in the Extension field.
Page 86 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones http://<phoneIPAddress>/servl et?p=network-adv&q=load Configure the web access type, Phone User Interface HTTP port and HTTPS port. Details of Configuration Parameters: Parameters Permitted Values Default wui.http_enable 0 or 1 Description: Enables or disables the user to access web user interface of the IP phone using the HTTP protocol.
Page 87 Configuring Basic Features Parameters Permitted Values Default Description: Enables or disables the user to access web user interface of the IP phone using the HTTPS protocol. 0-Disabled 1-Enabled Note: If you change this parameter, the IP phone will reboot to make the change take effect.
Page 88: Time And Date
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones The default HTTPS port number is 443. Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone. To configure web server type via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->Webserver Type.
Page 89: Ntp Time Server
Configuring Basic Features The following table lists available configuration methods for time and date. Option Configuration Methods Configuration Files NTP time server Web User Interface Phone User Interface Configuration Files Time Zone Web User Interface Phone User Interface Web User Interface Time Phone User Interface Configuration Files...
Page 90 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Procedure NTP time server and time zone can be configured using the configuration files or locally. Configure DHCP time feature. Parameters: local_time.dhcp_time Configure the NTP server, time zone. Parameters: Configuration File <MAC>.cfg local_time.ntp_server1...
Page 91 Configuring Basic Features Parameters Permitted Values Default Menu->Settings->Basic Settings->Time & Date->DHCP Time IP Address or Domain local_time.ntp_server1 cn.pool.ntp.org Name Description: Configures the IP address or the domain name of the NTP server 1. Example: local_time.ntp_server1 = 192.168.0.5 Web User Interface: Settings->Time &...
Page 92 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default local_time.time_zone -11 to +13 Description: Configures the time zone. Example: local_time.time_zone = +8 For more available time zones, refer to Appendix B: Time Zones on page 257. Web User Interface: Settings->Time &...
Page 93 Configuring Basic Features Enter the desired time interval in the Synchronism(15~86400s) field. Click Confirm to accept the change. To configure the NTP server and time zone via phone user interface: Press Menu->Settings->Basic Settings->Time & Date->SNTP Setting. Press , or the Switch soft key to select the time zone that applies to your area from the Time Zone field.
Page 94 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Configure the time and date formats. Parameters: local_time.time_format local_time.date_format Configure the time and date manually. Configure the time and date Web User Interface formats. Navigate to: http://<phoneIPAddress>/servlet Local ?p=settings-datetime&q=load Configure the time and date manually.
Page 95 Configuring Basic Features Parameters Permitted Values Default If it is set to 1 (Hour 24), the time will be displayed in 24-hour format (e.g., 2:00 PM displays as 14:00). Web User Interface: Settings->Time & Date->Time Format Phone User Interface: Menu->Settings->Basic Settings->Time & Date->Time & Date Format->Clock local_time.date_format 0, 1, 2, 3, 4, 5 or 6 Description:...
Page 96 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Enter the time and date in the corresponding fields. Click Confirm to accept the change. To configure the time and date format via web user interface: Click on Settings->Time & Date. Select the desired value from the pull-down list of Time Format.
Page 97: Daylight Saving Time
Configuring Basic Features To configure the time and date formats via phone user interface: Press Menu->Settings->Basic Settings->Time & Date->Time & Date Format. Press , or the Switch soft key to select the desired time format from the Clock field. Press , or the Switch soft key to select the desired date format from the Date Format field.
Page 98 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default 0-Disabled 1-Enabled 2-Automatic Web User Interface: Settings->Time & Date->Daylight Saving Time Phone User Interface: Menu->Settings->Basic Settings->Time & Date->SNTP Setting->DST local_time.dst_time_type 0 or 1 Description: Configures the DST time type. 0-DST By Date 1-DST By Week Note: It works only if the value of the parameter “local_time.summer_time”...
Page 99 Configuring Basic Features Parameters Permitted Values Default Hour of Day: 0=0am, 1=1am,…, 23=11pm Note: It works only if the value of the parameter “local_time.summer_time” is set to 1 (Enabled). Web User Interface: For DST By Date: Settings->Time & Date->Start Date For DST By Week: Settings->Time &...
Page 100 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Phone User Interface: None local_time.offset_time Integer from -300 to 300 Blank Description: Configures the offset time (in minutes) of DST. Note: It works only if the value of the parameter “local_time.summer_time” is set to 1 (Enabled).
Page 101 Configuring Basic Features Enter the end time in the End Date field. Mark the DST By Week radio box in the Fixed Type field. Select the desired values of DST Start Month, DST Start Day of Week, DST Start Day of Week Last in Month, Start Hour of Day; DST Stop Month, DST Stop Day of Week, DST Stop Day of Week Last in Month and End Hour of Day from the pull-down lists.
Page 102 DST settings for your area each year. Before customizing, you need to obtain the AutoDST file. You can ask the distributor or Yealink FAE for DST template. You can also obtain the DST template online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142. For more...
Page 103 Configuring Basic Features When customizing an AutoDST file, learn the following: <DSTData> indicates the start of a template and </DSTData> indicates the end of  a template. Add or modify time zone and DST settings between <DSTData> and </DSTData>.  The display order of time zone is corresponding to the szTime order specified in the ...
Page 104: Language
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of Configuration Parameters: Parameters Permitted Values Default auto_dst.url URL within 511 characters Blank Description: Configures the access URL of the AutoDST file (AutoDST.xml). Example: auto_dst.url = tftp://192.168.1.100/AutoDST.xml During the auto provisioning process, the IP phone connects to the provisioning server “192.168.1.100”, and downloads the AutoDST file “AutoDST.xml”.
Page 105: Loading Language Packs
IP phone. You can customize the translation of the existing language on the phone user interface. You can also make new languages (not included in the available language list) available for use on user interface by loading language packs to the SIP-T48G IP phone. Language packs can only be loaded using configuration files.
Page 106 10.GUI.Korean.lang lang-Korean.txt When adding a new language pack for the phone user interface of SIP-T48G IP Phones, the language pack must be formatted as “X.GUI.name.lang” (X starts from 11, “name” is replaced with the language name). If the language name is the same as the existing one, the existing language pack will be overridden by the new uploaded one.
Page 107 Configuring Basic Features Procedure Loading language pack can only be performed using the configuration files. Specify the access URL of the phone user interface language pack. Parameter: gui_lang.url Configuration File <y0000000000xx>.cfg Delete custom LCD language packs of the phone user interface. Parameter: gui_lang.delete Details of the Configuration Parameter:...
Page 108 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameter Permitted Values Default Description: Deletes the specified or all custom LCD language packs of the phone user interface. Example: Delete all custom language packs of the phone user interface. gui_lang.delete = http://localhost/all Delete a custom language pack of the phone user interface (e.g., lang+English.txt).
Page 109 English Description: Configures the language used on the phone user interface. Permitted Values: For SIP-T48G: English, Chinese_S, Chinese_T, French, German, Italian, Polish, Portuguese, Spanish, Turkish, Korean or the custom language name. For SIP-T22(P): English, Chinese_S, Chinese_T, French, German, Italian, Polish, Portuguese, Spanish, Turkish or Korean.
Page 110: Logo Customization
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default None To specify the language for the web user interface via web user interface: Click on Settings->Preference. Select the desired language from the pull-down list of Language. Click Confirm to accept the change.
Page 111 The common picture format can be *.gif/*.jpg/*.png/*.bmp. Yealink IP phones only support the *.dob format logo files. Yealink provides PictureExDemo tool to convert *.gif/*.jpg/*.png/*.bmp format to *.dob format. You can ask the distributor or Yealink FAE for the PictureExDemo tool.
Page 112 If it is set to 1 (System logo), the LCD screen will display the system logo. If it is set to 2 (Custom logo), the LCD screen will display the custom logo (you need to upload a custom logo file to the IP phone). Note: It is not applicable to SIP-T48G IP phones.
Page 113 “192.168.10.25”, and downloads the custom logo file “logo.dob”. Note: It works only if the value of the parameter “phone_setting.lcd_logo.mode” is set to 2 (Custom logo). It is not applicable to SIP-T48G IP phones. Web User Interface: Features->General Information->Upload Logo...
Page 114 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Click Upload to upload the file. Click Confirm to accept the change. The image logo screen and the idle screen are displayed alternately. Key as send allows assigning the pound key or asterisk key as the send key. Send sound allows the IP phone to play a key tone when a user presses the send key.
Page 115 Configuring Basic Features Configure a key tone. Parameter: features.key_tone Configure a send key. Configure send pound key. Navigate to: http://<phoneIPAddress>/servlet ?p=features-general&q=load Web User Interface Local Configure a send sound and key tone. Navigate to: http://<phoneIPAddress>/servlet ?p=features-audio&q=load Phone User Interface Configure a send key. Details of Configuration Parameters: Parameters Permitted Values...
Page 116 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Description: Enables or disables the IP phone to not send any pound key when pressing double 0-Disabled (Send one pound key by pressing double #) 1-Enabled (Do not send any pound key when pressing double #) Note: It works only if the value of the parameter “features.key_as_send”...
Page 117 Configuring Basic Features Parameters Permitted Values Default Features->Audio->Send Sound Phone User Interface: None To configure a send key via web user interface: Click on Features->General Information. Select the desired value from the pull-down list of Key As Send. Click Confirm to accept the change. To configure send pound key via web user interface: Click on Features->General Information.
Page 118 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of Send Pound Key. Click Confirm to accept the change. To configure a send sound and key tone via web user interface: Click on Features->Audio.
Page 119: Dial Plan
Configuring Basic Features Press the Save soft key to accept the change. Regular expression, often called a pattern, is an expression that specifies a set of strings. A regular expression provides a concise and flexible means to “match” (specify and recognize) strings of text, such as particular characters, words, or patterns of characters.
Page 120: Dial-Now
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones second parenthesis, that is, “99”. Dial-now is a string used to match numbers entered by the user. When entered numbers match the predefined dial-now rule, the IP phone will automatically dial out the numbers without pressing the send key.
Page 121 Configuring Basic Features Parameters Permitted Values Default Description: Configures the dial-now rule (the string used to match the numbers entered by the user). When entered numbers match the predefined dial-now rule, the IP phone will automatically dial out the numbers without pressing the send key. Example: dialplan.dialnow.rule.1 = 123 Web User Interface:...
Page 122 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Enter the desired value in the Rule field. Click Add to add the dial-now rule. To configure the delay time for the dial-now rule via web user interface: Click on Features->General Information. Enter the desired time within 1-14 (in seconds) in the Time-Out for Dial-Now Rule field.
Page 123: Save Call Log
Configuring Basic Features Calls, Placed Calls, and Forwarded Calls. Each call log list supports up to 100 entries. To store call information, you must enable save call log feature in advance. You can access the call history information via web user interface: Directory->Phone Call Info. Procedure Call log can be configured using the configuration files or locally.
Page 124: Missed Call Log
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of Save Call Log. Click Confirm to accept the change. To configure call log feature via phone user interface: Press Menu->Features->History Setting. Press , or the Switch soft key to select the desired value from the History Record field.
Page 125: Dial Search Delay
Configuring Basic Features Details of the Configuration Parameter: Parameter Permitted Values Default account.1.missed_calllog 0 or 1 Description: Enables or disables the IP phone to indicate and record missed calls for the account. 0-Disabled 1-Enabled If it is set to 0 (Disabled), the IP phone does not display indicator on the idle screen and log the missed call in the Missed Calls list when missed calls.
Page 126 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Procedure Dial search delay can be configured using the configuration files or locally. Configure dial search delay feature. Configuration File <y0000000000xx>.cfg Parameter: super_search.delay_time Configure dial search delay feature. Local Web User Interface Navigate to: http://<phoneIPAddress>/servlet...
Page 127: Live Dialpad
Configuring Basic Features Select the desired value from the pull-down list of Dial Search Delay. Click Confirm to accept the change. Live dialpad allows IP phones to automatically dial out the entered phone number after a specified period of time. Procedure Live dialpad can be configured using the configuration files or locally.
Page 128 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Description: Enables or disables live dialpad feature. 0-Disabled 1-Enabled If it is set to 1 (Enabled), the IP phone will automatically dial out the entered phone number on the dialing screen without pressing a send key.
Page 129: Call Waiting
Configuring Basic Features Enter the desired delay time in the Inter Digit Time(1~14s) field. Click Confirm to accept the change. Call waiting allows IP phones to receive a new incoming call when there is already an active call. The new incoming call is presented to the user visually on the LCD screen. Call waiting tone allows the IP phone to play a short tone, to remind the user audibly of a new incoming call during conversation.
Page 130 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones http://<phoneIPAddress>/servlet ?p=features-audio&q=load Configure call waiting and call Phone User Interface waiting tone. Details of Configuration Parameters: Parameters Permitted Values Default call_waiting.enable 0 or 1 Description: Enables or disables call waiting feature. 0-Disabled 1-Enabled If it is set to 0 (Disabled), a new incoming call is automatically rejected by the IP...
Page 131 Configuring Basic Features To configure call waiting via web user interface: Click on Features->General Information. Select the desired value from the pull-down list of Call Waiting. Click Confirm to accept the change. To configure call waiting tone via web user interface: Click on Features->Audio.
Page 132: Redial Tone
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Redial tone allows IP phones to continue to play the dial tone after inputting the preset numbers on the pre-dialing screen. Procedure Redial tone can be configured using the configuration files or locally. Configure redial tone feature.
Page 133: Ringer Device For Headset
Configuring Basic Features Enter the desired value in the Redial Tone field. Click Confirm to accept the change. The IP phones support either or both speaker and headset ringer devices. If the ringer device is set to Headset or Headset&Speaker, the headset should be connected to the IP phone and the headset mode also should be activated in advance.
Page 134: Auto Answer
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Description: Configures the ringer device for the IP phone. 0-Use Speaker 1-Use Headset 2-Use Headset & Speaker If the ringer device is set to Headset or Headset&Speaker, the headset should be connected to the IP phone and the headset mode also should be activated in advance.
Page 135 Configuring Basic Features Procedure Auto answer can be configured using the configuration files or locally. Configure auto answer. <MAC>.cfg Parameter: account.1.auto_answer Configuration File Specify a period of delay time for auto answer. <y0000000000xx>.cfg Parameter: features.auto_answer_delay Configure auto answer. Navigate to: http://<phoneIPAddress>/servlet ?p=account-basic&q=load&acc Local...
Page 136 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default features.auto_answer_delay Integer from 1 to 4 Description: Configures the delay time (in seconds) before the IP phone automatically answers an incoming call. Web User Interface: Features->General Information->Auto-Answer Delay(1~4s) Phone User Interface: None...
Page 137: Always On Line
Configuring Basic Features Enter the desired time in the Auto-Answer Delay(1~4s) field. Click Confirm to accept the change. Always on line feature allow IP phones to maintain the current status until you manually change it. For example, the current status of the phone is Available, if the always online feature is enabled, then the phone status will stay Available until you manually change Procedure Always on line can be configured using the configuration files or locally.
Page 138 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of the Configuration Parameter: Parameter Permitted Values Default features.always_online.enable 0 or 1 Description: Enables or disables the IP phone to maintain current status until you manually change it. 0-Disabled 1-Enabled Note: If your phone status is DND before dialing an emergency number, then the...
Page 139: Allow Mute
Configuring Basic Features You can mute the microphone of the active audio device during an active call, and then the other party cannot hear you. If allow mute feature is disabled, you cannot mute an active call. Procedure Allow mute can be configured using the configuration files or locally. Configure allow mute feature.
Page 140: Busy Tone Delay
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of Allow Mute. Click Confirm to accept the change. Busy tone is audible to the other party, indicating that the call connection has been broken when one party releases a call.
Page 141: Return Code When Refuse
Configuring Basic Features Parameter Permitted Values Default Description: Configures the duration time (in seconds) for the busy tone. When one party releases the call, a busy tone is audible to the other party indicating that the call connection breaks. 0-0s 3-3s 5-5s If it is set to 3 (3s), a busy tone is audible for 3 seconds on the IP phone.
Page 142 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones 486 (Busy Here)  603 (Decline)  Procedure Return code for refused call can be configured using the configuration files or locally. Specify the return code and the reason of the SIP response message when refusing a call.
Page 143: Early Media
Configuring Basic Features Select the desired value from the pull-down list of Return Code When Refuse. Click Confirm to accept the change. Early media refers to media (e.g., audio and video) played to the caller before a SIP call is actually established. Current implementation supports early media through the 183 message.
Page 144: Call Hold
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of the Configuration Parameter: Parameter Permitted Values Default phone_setting.is_deal180 0 or 1 Description: Enables or disables the IP phone to deal with the 180 SIP message received after the 183 SIP message.
Page 145 Configuring Basic Features call hold methods, one is RFC 3264, which sets the “a” (media attribute) in the SDP to sendonly, recvonly or inactive (e.g., a=sendonly). The other is RFC 2543, which sets the “c” (connection addresses for the media streams) in the SDP to zero (e.g., c=0.0.0.0). Call hold tone allows IP phones to play a warning tone at regular intervals when there is a call on hold.
Page 146: Call Number Filter
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Description: Configures the interval (in seconds) at which the IP phone play a warning tone when there is a call on hold. If it is set to 30 (30s), the IP phone will play a warning tone every 30 seconds when there is a call on hold.
Page 147 Configuring Basic Features Procedure Call number filter can be configured using the configuration files or locally. Configure the characters the IP phone filters when dialing. Configuration File <y0000000000xx>.cfg Parameters: features.call_num_filter Configure the characters the IP phone filters when dialing. Local Web User Interface Navigate to: http://<phoneIPAddress>/servlet?p=...
Page 148: Dtmf
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Enter the desired characters in the Call Number Filter field. Click Confirm to accept the change. DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for telecommunication signaling over analog telephone lines in the voice-frequency band. DTMF is the signal sent from the IP phone to the network, which is generated when pressing the IP phone’s keypad during a call.
Page 149 Configuring Basic Features voice path. The RTP Event packet contains 4 bytes. The 4 bytes are distributed over several fields denoted as Event, End bit, R-bit, Volume and Duration. If the End bit is set to 1, the packet contains the end of the DTMF event. You can configure the sending times of the end RTP Event packet.
Page 150: Suppress Dtmf Display
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value (1-3) from the pull-down list of DTMF Repetition. Click Confirm to accept the change. Suppress DTMF display allows IP phones to suppress the display of DTMF digits during an active call.
Page 151 Configuring Basic Features Details of Configuration Parameters: Parameters Permitted Values Default features.dtmf.hide 0 or 1 Description: Enables or disables the IP phone to suppress the display of DTMF digits during an active call. 0-Disabled 1-Enabled If it is set to 1 (Enabled), the DTMF digits are displayed as asterisks. Web User Interface: Features->General Information->Suppress DTMF Display Phone User Interface:...
Page 152: Transfer Via Dtmf
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of Suppress DTMF Display Delay. Click Confirm to accept the change. Call transfer is implemented via DTMF on some traditional servers. The IP phone sends specified DTMF digits to the server for transferring calls to third parties.
Page 153 Configuring Basic Features Parameters Permitted Values Default Description: Enables or disables the IP phone to send DTMF sequences for transfer function when pressing the Tran/Transfer soft key or TRAN/TRANSFER key. 0-Disabled 1-Enabled If it is set to 0 (Disabled), the IP phone will perform the transfer as normal when pressing the Tran/Transfer soft key or TRAN/TRANSFER key during a call.
Page 154: Play Local Dtmf Tone
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Enter the specified DTMF digits in the Tran Send DTMF field. Click Confirm to accept the change. Play local DTMF tone allows IP phones to play a local DTMF tone during an active call. Procedure Configuration changes can be performed using the configuration files or locally.
Page 155: Voice Mail Without Pin
Configuring Basic Features Details of Configuration Parameters: Parameters Permitted Values Default features.play_local_dtmf_tone_enable 0 or 1 Description: Enables or disables the IP phone to play a local DTMF tone. 0-Disabled 1-Enabled Web User Interface: Features->General Information->Play Local DTMF Tone Phone User Interface: None To configure play local DTMF tone via web user interface: Click on Features->General Information.
Page 156 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Procedure Voice mail without PIN can be configured using the configuration files or locally. Configure voice mail without PIN. Configuration <y0000000000xx>.cfg Parameters: File account.1.voice_mail.skin_pin.enable Configure voice mail without PIN. Navigate to: Local Web User Interface...
Page 157 Configuring Basic Features Select the desired value from the pull-down list of Voice Mail without PIN. Click Confirm to accept the change. E911 (Enhanced 911), a location technology that will enable emergency services to locate the position of the caller. Emergency services can respond immediately by pinpointing a caller's location.
Page 158: Boss/Admin Light
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of Configuration Parameters: Parameters Permitted Values Default features.location_info_indicator.enable 0 or 1 Description: Enables or disables the idle screen to display the notification “Location is not set” when the location of the phone is not set. 0-Disabled 1-Enabled Web User Interface:...
Page 159: Boss/Admin Light
Boss/admin light feature allows the boss’s line key LED to be automatically turned on when the delegate is assigned. It is used to notify the user that he/she is a delegate of others. This feature is not applicable to SIP-T48G IP phones. Procedure Boss/admin light can be configured using the configuration files or locally.
Page 160 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of Boss/Admin Light. A dialog box pops up to prompt that settings will take effect after a reboot. Click Confirm to accept the change. BToE (Better Together over Ethernet) feature enables SIP IP phones to interoperate with the Lync client for third party call control.
Page 161 Configuring Basic Features Procedure BToE can be configured using the configuration files or locally. Configure BToE. Parameters: sip.btoe.enable Configuration <y0000000000xx>.cfg File Configure BToE as audio device. Parameters: sip.btoe.as_audio_dev.enable Configure BToE as audio device. Navigate to: Local Web User Interface http://<phoneIPAddress>/servlet?p=fe atures-audio&q=load Details of Configuration Parameters: Parameters...
Page 162 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default you want to use BToE in the VDI environment. Web User Interface: Features->Audio->BToE as Audio Device (VDI support) Phone User Interface: None To configure BToE as audio device via web user interface: Click on Feature->Audio.
Page 163: Configuring Advanced Features
VLAN via LLDP , CDP or DHCP . The assignment takes effect in this order: assignment via LLDP/CDP , manual configuration, then assignment via DHCP . VLAN Feature on Yealink IP Phones For more information on VLAN, refer to , available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Page 164 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones information about other devices. When LLDP feature is enabled on IP phones, the IP phones periodically advertise their own information to the directly connected LLDP-enabled switch. The IP phones can also receive LLDP packets from the connected switch.
Page 165 Configuring Advanced Features Parameters Permitted Values Default network.lldp.packet_interval Integer from 1 to 3600 Description: Configures the interval (in seconds) for the IP phone to send the LLDP (Linker Layer Discovery Protocol) request. Note: It works only if the value of the parameter “network.lldp.enable” is set to 1 (Enabled).
Page 166 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones When CDP feature is enabled on IP phones, the IP phones periodically advertise their own information to the directly connected CDP-enabled switch. The IP phones can also receive CDP packets from the connected switch. When the VLAN configurations on the IP phones are different from the ones sent by the switch, the IP phones perform an update and reboot.
Page 167: Manual Configuration For Vlan
Configuring Advanced Features Parameters Permitted Values Default Discovery Protocol) request. Note: It works only if the value of the parameter “network.cdp.enable” is set to 1 (Enabled). If you change this parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Advanced->CDP->Packet Interval (1~3600s) Phone User Interface:...
Page 168 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones File and PC port manually. Parameters: network.vlan.internet_port_enable network.vlan.internet_port_vid network.vlan.internet_port_priority network.vlan.pc_port_enable network.vlan.pc_port_vid network.vlan.pc_port_priority Configure VLAN for the Internet port and PC port manually. Web User Interface Navigate to: Local http://<phoneIPAddress>/servlet?p=n etwork-adv&q=load Configure VLAN for the Internet port Phone User Interface...
Page 169 Configuring Advanced Features Parameters Permitted Values Default take effect. Web User Interface: Network->Advanced->VLAN->WAN Port->VID (1-4094) Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->VLAN->WAN Port->VID Number network.vlan.internet_port_priority Integer from 0 to 7 Description: Configures VLAN priority for the Internet (WAN) port. 7 is the highest priority, 0 is the lowest priority.
Page 170 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Note: If you change this parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Advanced->VLAN->PC Port->VID (1-4094) Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->VLAN->PC Port->VID Number network.vlan.pc_port_priority...
Page 171 Configuring Advanced Features Select the desired value (0-7) from the pull-down list of Priority. Click Confirm to accept the change. A dialog box pops up to prompt that the settings will take effect after a reboot. Click OK to reboot the phone. To configure VLAN for PC port via web user interface: Click on Network->Advanced.
Page 172: Dhcp Vlan
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones To configure VLAN for Internet port (or PC port) via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->VLAN->WAN Port (or PC Port). Press , or the Switch soft key to select the desired value from the VLAN Status field.
Page 173 Configuring Advanced Features Parameters Permitted Values Default 1-Enabled Note: If you change this parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Advanced->VLAN->DHCP VLAN->Active Phone User Interface: None network.vlan.dhcp_option Integer from 1 to 255 Description: Configures the DHCP option from which the IP phone will obtain the VLAN settings.
Page 174: Voice Quality Monitoring
(RTCP-XR), provides the metrics contained in RTCP-XR packets for monitoring the quality of calls. These metrics include network packet loss, delay metrics, analog metrics and voice quality metrics. This feature is only applicable to SIP-T48G IP phones. Procedure RTCP-XR can be configured using the configuration files.
Page 175: Quality Of Service
0-Disabled 1-Enabled Note: If you change this parameter, the IP phone will reboot to make the change take effect. It is only applicable to SIP-T48G IP phones. Web User Interface: None Phone User Interface: None Quality of Service (QoS) is the ability to provide different priorities for different packets in the network, allowing the transport of traffic with special requirements.
Page 176: Voice Qos
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Services Code Point (DSCP) is used to define DiffServ classes and stored in the first six bits of the ToS (Type of Service) field. Each router on the network can provide QoS simply based on the DiffServ class.
Page 177 Configuring Advanced Features packets. Parameters: network.qos.rtptos network.qos.signaltos Configure the DSCPs for voice packets and SIP packets. Local Web User Interface Navigate to: http://<phoneIPAddress>/se rvlet?p=network-adv&q=lo Details of Configuration Parameters: Parameters Permitted Values Default network.qos.rtptos Integer from 0 to 63 Description: Configures the DSCP (Differentiated Services Code Point) for voice packets. The default DSCP value for RTP packets is 46 (Expedited Forwarding).
Page 178: Snmp
SNMP server. IP phones only support the GET request from the SNMP server. SNMP is only applicable to SIP-T48G IP phones.
Page 179 The following table lists the basic object identifiers (OIDs) supported by IP phones: Description The textual identification of the contact person for the IP phone, together with the contact information. YEALINK-MIB 1.3.6.1.2.1.37459.2.1.1.0 For example, Sysadmin (root@localhost) An administratively-assigned name for YEALINK-MIB 1.3.6.1.2.1.37459.2.1.2.0...
Page 180 Enables or disables SNMP (Simple Network Management Protocol) feature on the IP phone. 0-Disabled 1-Enabled Note: If you change this parameter, the IP phone will reboot to make the change take effect. It is only applicable to SIP-T48G IP phones. Web User Interface: Network->Advanced->SNMP->Active Phone User Interface: None Integer from 1 to network.snmp.port...
Page 181 If the value is left blank, the IP phone cannot receive or handle any GET request. Note: If you change this parameter, the IP phone will reboot to make the change take effect. It is only applicable to SIP-T48G IP phones. Web User Interface: Network->Advanced->SNMP->Trusted Address...
Page 182 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Multiple addresses are separated by space. Click Confirm to accept the change. A dialog box pops up to prompt that the settings will take effect after reboot. Click OK to reboot the IP phone. IPv6 is the next generation network layer protocol, designed as a replacement for the current IPv4 protocol.
Page 183 Stateless Address Autoconfiguration”, and can be used separately or in addition to the stateless autoconfiguration to obtain configuration parameters. Note Stateful DHCPv6 address assignment method feature is only applicable to SIP-T48G IP phones. If the IP phone enables the SLAAC and DHCPv6 features simultaneously, the IP phone will obtain the IP address via SLAAC and obtain other network parameters via DHCPv6.
Page 184 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameter: network.ipv6_static_dns_enable Configure the IPv6 address assignment method. Configure the IPv6 static DNS. Web User Interface Navigate to: http://<phoneIPAddress>/servlet?p =network&q=load Local Configure the IPv6 address assignment method. Phone User Configure the IPv6 static DNS.
Page 185 Configuring Advanced Features Parameters Permitted Values Default to 1 (IPv6) or 2 (IPv4 & IPv6). If you change this parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Basic->IPv6 Config->DHCP/Static IP Address Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port->IPv6 network.ipv6_static_dns_enable...
Page 186 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port->IPv6->Static IPv6 Client->IPv6 network.ipv6_prefix Integer from 0 to 128 Description: Configures the IPv6 prefix. Note: It works only if the value of the parameter “network.ip_address_mode” is set to 1 (IPv6) or 2 (IPv4 &...
Page 187 Configuring Advanced Features Parameters Permitted Values Default Example: network.ipv6_primary_dns = 3036:1:1:c3c7: c11c:5447:23a6:256 Note: It works only if the value of the parameter "network.ip_address_mode" is set to 1 (IPv6) or 2 (IPv4 & IPv6). In DHCP environment, you also need to make sure the value of the parameter "network.ipv6_static_dns_enable"...
Page 188 Note: If you change this parameter, the IP phone will reboot to make the change take effect. It is only applicable to SIP-T48G IP phones. SLAAC is enabled on SIP-T22(P) IP phones by default. You are not allowed to configure this parameter for SIP-T22(P) IP phones.
Page 189 Click Confirm to accept the change. A dialog box pops up to prompt that the settings will take effect after a reboot. Click OK to reboot the phone. To configure SLAAC feature via web user interface (only applicable to SIP-T48G): Click on Network->Advanced.
Page 190 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones In the ICMPv6 Status block, select the desired value from the pull-down list of Active. Click Confirm to accept the change. To configure IPv6 address assignment method via phone user interface: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN Port.
Page 191: Ring Tones
To set the custom ring tones, you need to upload the custom ring tones to the IP phone in advance. The ring tone format must meet the following: Phone Model Format Single File Size Total File Size SIP-T48G .wav <=8MB <=20MB SIP-TT22(P) .wav <=100KB <=100KB...
Page 192 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Delete all custom ring tone files. Parameter: ringtone.delete Configure a ring tone on a per-line basis. <MAC>.cfg Parameters: account.1.ringtone.ring_type Upload the custom ring tones. Configure a ring tone for the IP phone.
Page 193 = Customring.wav Permitted Values: Ring1.wav, Ring2.wav, Ring3.wav, Ring4.wav, Ring5.wav, Ring6.wav, Ring7.wav, Ring8.wav or custom ring tone name (e.g., Customring.wav). Note: Ring 5-8 are only applicable to SIP-T48G IP phones. Web User Interface: Settings->Preference->Ring Type Phone User Interface: Menu->Settings->Basic Settings->Ring Tones ringtone.delete...
Page 194 "phone_setting.ring_type". Permitted Values: Common, Ring1.wav, Ring2.wav, Ring3.wav, Ring4.wav, Ring5.wav, Ring6.wav, Ring7.wav, Ring8.wav or custom ring tone name (e.g., Customring.wav). Note: Ring 5-8 are only applicable to SIP-T48G IP phones. Web User Interface: Account->Basic->Ring Type Phone User Interface: None To upload a custom ring tone via web user interface: Click on Settings->Preference.
Page 195 Configuring Audio Features Select the desired ring tone from the pull-down list of Ring Type. Click Confirm to accept the change. To change the ring tone for the account via web user interface: Click on Account->Basic. Select the desired ring tone from the pull-down list of Ring Type. Click Confirm to accept the change.
Page 196 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Brazil  Belgium  Chile  China  Czech  Czech ETSI  Denmark  Finland  France  Germany  Great Britain  Greece  Hungary  Lithuania ...
Page 197 Configuring Audio Features Condition Description Info When receiving a special message Stutter When receiving a voice mail Auto Answer When automatically answering a call Procedure Tones can be configured using the configuration files or locally. Configure the tones for the IP phone.
Page 198 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Switzerland, Sweden, Russia, United States. Example: voice.tone.country = Custom Web User Interface: Settings->Tones->Select Country Phone User Interface: None voice.tone.dial String Blank Description: Customizes the dial tone. tonelist = element[,element] [,element]…...
Page 199 Configuring Audio Features Parameters Permitted Values Default Custom. Web User Interface: Settings->Tones->Ring Back Phone User Interface: None voice.tone.busy String Blank Description: Customizes the tone when the callee is busy. The value format is Freq/Duration. For more information on the value format, refer to the parameter “voice.tone.dial”.
Page 200 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Note: It works only if the value of the parameter “voice.tone.country” is set to Custom. Web User Interface: Settings->Tones->Call Waiting Phone User Interface: None voice.tone.dialrecall String Blank Description:...
Page 201 Configuring Audio Features Parameters Permitted Values Default The value format is Freq/Duration. For more information on the value format, refer to the parameter “voice.tone.dial”. Note: It works only if the value of the parameter “voice.tone.country” is set to Custom. Web User Interface: Settings->Tones->Stutter Phone User Interface: None...
Page 202 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Click Confirm to accept the change. Headset prior allows users to use headset preferentially if a headset is physically connected to the IP phone. This feature is especially useful for permanent or full-time headset users.
Page 203 Configuring Audio Features To configure headset prior via web user interface: Click on Features->General Information. Select the desired value from the pull-down list of Headset Prior. Click Confirm to accept the change. Dual headset allows users to use two headsets on one IP phone. To use this feature, users need to physically connect two headsets to the headset and handset jacks respectively.
Page 204 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of the Configuration Parameter: Parameter Permitted Values Default features.headset_training 0 or 1 Description: Enables or disables dual headset feature. 0-Disabled 1-Enabled If it is set to 1 (Enabled), users can use two headsets on one phone. When the IP phone joins in a call, the users with the headset connected to the headset jack have a full-duplex conversation, while the users with the headset connected to the handset jack are only allowed to listen to.
Page 205 The following table lists the audio codecs supported by each phone model: Phone Model Supported Audio Codecs Default Audio Codecs G722, PCMU, PCMA, G729, G726-16, G722, PCMU, PCMA, SIP-T48G G726-24, G726-32, G726-40, iLBC, G729 G723_53, G723_63, GSM G722, PCMU, PCMA, G729, G726-16, G722, PCMU, PCMA,...
Page 206 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones The corresponding attributes of the codec are listed as follows: Codec Configuration Methods Priority RTPmap Configuration Files G722 Web User Interface Configuration Files PCMU Web User Interface Configuration Files PCMA Web User Interface Configuration Files...
Page 207 When Y=9, the default value is 0; When Y=10, the default value is 0; When Y=11, the default value is 0; When Y=12, the default value is 0; (only applicable to SIP-T48G IP phones) Example: account.1.codec.1.enable = 1 It means that the codec PCMU is enabled on the account.
Page 208 When Y=9, the default value is G726-24; When Y=10, the default value is G726-32; When Y=11, the default value is G726-40; When Y=12, the default value is GSM; (only applicable to SIP-T48G IP phones) Example: account.1.codec.1.payload_type = PCMU Web User Interface: Account->Codec...
Page 209 When Y=9, the default value is 0; When Y=10, the default value is 0; When Y=11, the default value is 0; When Y=12, the default value is 0; (only applicable to SIP-T48G IP phones) Example: account.1.codec.1.priority = 2 Web User Interface: Account->Codec...
Page 210 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default account.1.codec.1.rtpmap = 0 Web User Interface: None Phone User Interface: None To configure the codecs to use and adjust the priority of the enabled codecs on a per-line basis via web user interface: Click on Account->Codec.
Page 211: Acoustic Echo Cancellation
Configuring Audio Features Acoustic Echo Cancellation (AEC) is used to reduce acoustic echo from a voice call to provide natural full-duplex communication patterns. It also increases the capacity achieved through silence suppression by preventing echo from traveling across a network. IP phones employ advanced AEC for hands-free operation. AEC is not normally required for calls via the handset.
Page 212: Background Noise Suppression
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameter Permitted Values Default Phone User Interface: None To configure AEC via web user interface: Click on Settings->Voice. Select the desired value from the pull-down list of ECHO. Click Confirm to accept the change. Background noise suppression (BNS) is designed primarily for hands-free operation and reduces background noise to enhance communication in noisy environments.
Page 213 Configuring Audio Features audio session. VAD can avoid unnecessary coding or transmission of silence packets in VoIP applications, saving on computation and network bandwidth. Procedure VAD can be configured using the configuration files or locally. Configure VAD. Configuration File <y0000000000xx>.cfg Parameter: voice.vad Configure VAD.
Page 214: Comfort Noise Generation
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of VAD. Click Confirm to accept the change. Comfort Noise Generation (CNG) is used to generate background noise for voice communications during periods of silence in a conversation. It is a part of the silence suppression or VAD handling for VoIP technology.
Page 215 Configuring Audio Features Procedure CNG can be configured using the configuration files or locally. Configure CNG. Configuration File <y0000000000xx>.cfg Parameter: voice.cng Configure CNG. Navigate to: Local Web User Interface http://<phoneIPAddress>/ servlet?p=settings-voice& q=load Details of the Configuration Parameter: Parameter Permitted Values Default voice.cng 0 or 1...
Page 216: Jitter Buffer
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired value from the pull-down list of CNG. Click Confirm to accept the change. Jitter buffer is a shared data area where voice packets can be collected, stored, and sent to the voice processor in even intervals.
Page 217 Configuring Audio Features time for jitter buffer. Navigate to: http://<phoneIPAddress>/ servlet?p=settings-voice& q=load Details of Configuration Parameters: Parameters Permitted Values Default voice.jib.adaptive 0 or 1 Description: Configures the type of jitter buffer. 0-Fixed 1-Adaptive Web User Interface: Settings->Voice->JITTER BUFFER->Type Phone User Interface: None voice.jib.min Integer from 0 to 400...
Page 218 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Phone User Interface: None voice.jib.normal Integer from 0 to 400 Description: Configures the normal delay time (in milliseconds) of jitter buffer. Note: It works only if the value of the parameter “voice.jib.adaptive” is set to 0 (Fixed).
Page 219: Configuring Security Features
Configuring Security Features This chapter provides information for making configuration changes for the following security-related features: User Password  Administrator Password  Auto-Logout  Phone Lock  Transport Layer Security  Encrypting Configuration Files  802.1X Authentication  Some menu options are protected by two privilege levels, user and administrator, each with its own password.
Page 220 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Details of the Configuration Parameter: Parameter Permitted Values Default security.user_password String within 32 characters user Description: Configures the password of the user for phone’s web user interface access. The IP phone uses “user” as the default user password. The valid value format is username:new password.
Page 221 Configuring Security Features Advanced menu options are strictly used by administrators. Users can configure them only if they have administrator privileges. The administrator password can only be changed by an administrator. The default administrator password is “admin”. For security reasons, the administrator should change the default administrator password as soon as possible.
Page 222: Auto-Logout Time
Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameter Permitted Values Default None To change the administrator password via web user interface: Click on Security->Password. Select admin from the pull-down list of User Type. Enter the current administrator password in the Old Password field. Enter new password in the New Password and Confirm Password fields.
Page 223 Configuring Security Features Configure auto-logout time. Navigate to: Local Web User Interface http://<phoneIPAddress>/servlet ?p=features-general&q=load Details of the Configuration Parameter: Parameter Permitted Values Default features.relog_offtime Integer from 1 to 1000 Description: Configures the timeout interval (in minutes) for web access authentication. Example: features.relog_offtime = 5 If you log into the web user interface and leave it for 5 minutes, it will automatically...
Page 224 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Click Confirm to accept the change. Phone lock is used to lock the IP phone to prevent it from unauthorized use. Once the IP phone is locked, a user must enter the unlock PIN to unlock it. You can do one of the following to lock the phone: Long press the pound key when the IP phone is idle.
Page 225 Configuring Security Features Enter the unlock PIN in the Phone Unlock PIN(6~15 Digit) field. Click Confirm to accept the change. To change the unlock PIN via phone user interface: Press Menu->Settings->Basic Settings->Phone Lock->Phone Unlock PIN. Enter the current unlock PIN in the Current PIN field. Enter the new unlock PIN in the New PIN field.
Page 226 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Phone User Interface Configure account lock. Details of Configuration Parameters: Parameters Permitted Values Default features.lock_account.enable 0 or 1 Description: Enables or disables the IP phone to lock the account to prevent the account being signed in or signed out randomly.
Page 227 Configuring Security Features TLS is a commonly-used protocol for providing communications privacy and managing the security of message transmission, allowing IP phones to communicate with other remote parties and connect to the HTTPS URL for provisioning in a way that is designed to prevent eavesdropping and tampering.
Page 228 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones RC4-MD5  EXP1024-DHE-DSS-DES-CBC-SHA  EXP1024-DES-CBC-SHA  EDH-RSA-DES-CBC-SHA  EDH-DSS-DES-CBC-SHA  DES-CBC-SHA  EXP1024-DHE-DSS-RC4-SHA  EXP1024-RC4-SHA  EXP1024-RC4-MD5  EXP-EDH-RSA-DES-CBC-SHA  EXP-EDH-DSS-DES-CBC-SHA  EXP-DES-CBC-SHA  EXP-RC4-MD5  The following figure illustrates the TLS messages exchanged between the IP phone and TLS server to establish an encrypted communication channel: Step1: IP phone sends “Client Hello”...
Page 229 A unique server certificate: It is unique to an IP phone (based on the MAC address) and issued by the Yealink Certificate Authority (CA). A generic server certificate: It issued by the Yealink Certificate Authority (CA). Only if no unique certificate exists, the IP phone may send a generic certificate for authentication.
Page 230 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters: security.dev_cert Upload the trusted certificates. Parameter: trusted_certificates.url Delete all uploaded trusted certificates. Parameter: trusted_certificates.delete Upload the server certificates. Parameter: server_certificates.url Delete all uploaded server certificates. Parameter: server_certificates.delete Configure trusted certificates feature. Upload the trusted certificates.
Page 231 Configuring Security Features Parameters Permitted Values Default certificate sent by the server is valid or not. If it is set to 1 (Enabled), the IP phone will authenticate the server certificate based on the trusted certificates list. Only when the authentication succeeds, the IP phone will trust the server.
Page 232 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default Phone User Interface: None security.dev_cert 0 or 1 Description: Configures the type of the device certificates for the IP phone to send for TLS authentication 0-Default Certificates 1-Custom Certificates Note: If you change this parameter, the IP phone will reboot to make the change...
Page 233 Configuring Security Features Parameters Permitted Values Default Web User Interface: None Phone User Interface: None URL within 511 server_certificates.url Blank characters Description: Configures the access URL of the certificate the IP phone sends for authentication. Example: server_certificates.url = http://192.168.1.20/ca.pem Note: The certificate you want to upload must be in *.pem or *.cer format. Web User Interface: Security->Server Certificates->Load server cer file Phone User Interface:...
Page 234 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select the desired values from the pull-down lists of Only Accept Trusted Certificates, Common Name Validation and CA Certificates. Click Confirm to accept the change. To upload a trusted certificate via web user interface: Click on Security->Trusted Certificates.
Page 235 Configuring Security Features To configure the server certificates via web user interface: Click on Security->Server Certificates. Select the desired value from the pull-down list of Device Certificates. Click Confirm to accept the change. To upload a server certificate via web user interface: Click on Security->Server Certificates.
Page 236 (the same or different keys for configuration files) and generates encrypted configuration files with the same file name as before. For a Microsoft Windows platform, you can use a Yealink-supplied encryption tool "Config_Encrypt_Tool.exe" to encrypt the <y0000000000xx>.cfg and <MAC>.cfg files respectively.
Page 237 Configuring Security Features (Optional.) Click Browse to locate the target directory from your local system in the Target Directory field. The tool uses the file folder “Encrypted” as the target directory by default. (Optional.) Mark the desired radio box in the AES Model field. If you mark the Manual radio box, you can enter an AES key in the AES KEY field or click Re-Generate to generate an AES key in the AES KEY field.
Page 238 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Procedure AES keys can be configured using the configuration files. Configure AES keys. Parameters: Configuration File <y0000000000xx>.cfg auto_provision.aes_key_16.com auto_provision.aes_key_16.mac Configure AES keys. Navigate to: Web User Interface http://<phoneIPAddress>/servlet?p Local =settings-autop&q=load Phone User Interface Configure AES keys.
Page 239: X Authentication
Configuring Security Features Parameters Permitted Values Default Phone User Interface: Menu->Settings->Advanced Settings->Set AES Key->MAC-oriented To configure AES keys via web user interface: Click on Settings->Auto Provision. Enter the values in the Common AES Key and MAC-Oriented AES Key fields. AES keys must be 16 characters and the supported characters contain: 0-9, A-Z, a-z. Click Confirm to accept the change.
Page 240 IP phone is allowed to access resources located on the protected side of the network. IP phones support protocols EAP-MD5, EAP-TLS, PEAP-MSCHAPv2 and EAP-TTLS/EAP-MSCHAPv2 for 802.1X authentication. Yealink 802.1X Authentication For more information on 802.1X authentication, refer to available online: http://www.yealink.com/DocumentDownload.aspx?CateId=142&flag=142.
Page 241 Configuring Security Features Parameters Permitted Values Default Note: If you change this parameter, the IP phone will reboot to make the change take effect. Web User Interface: Network->Advanced->802.1x->802.1x Mode Phone User Interface: Menu->Settings->Advanced Settings (default password: admin) ->Network->802.1x Settings->802.1x Mode network.802_1x.identity String within 32 characters Blank...
Page 242 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Parameters Permitted Values Default network.802_1x.root_cert_url URL within 511 characters Blank Description: Configures the access URL of the CA certificate Example: network.802_1x.root_cert_url = http://192.168.1.10/ca.pem Note: It works only if the value of the parameter “network.802_1x.mode” is set to 2, 3 or 4.
Page 243 Configuring Security Features 2) Enter the password for authentication in the MD5 Password field. b) If you select EAP-TLS: 1) Enter the user name for authentication in the Identity field. 2) Leave the MD5 Password field blank. 3) In the CA Certificates field, click Browse to select the desired CA certificate (*.pem, *.crt, *.cer or *.der) from your local system.
Page 244 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones 5) Click Upload to upload the certificates. c) If you select PEAP-MSCHAPv2: 1) Enter the user name for authentication in the Identity field. 2) Enter the password for authentication in the MD5 Password field. 3) In the CA Certificates field, click Browse to select the desired CA certificate (*.pem, *.crt, *.cer or *.der) from your local system.
Page 245 Configuring Security Features 4) Click Upload to upload the certificate. d) If you select EAP-TTLS/EAP-MSCHAPv2: 1) Enter the user name for authentication in the Identity field. 2) Enter the password for authentication in the MD5 Password field. 3) In the CA Certificates field, click Browse to select the desired CA certificate (*.pem, *.crt, *.cer or *.der) from your local system.
Page 246 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones 4) Click Upload to upload the certificate. Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone. To configure the 802.1X authentication via phone user interface after: Press Menu->Settings->Advanced Settings (default password: admin) ->Network->802.1x Settings.
Page 247 Configuring Security Features Click Save to accept the change. The IP phone reboots automatically to make the settings effective after a period of time.
Page 248 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones...
Page 249: Troubleshooting
Troubleshooting This chapter provides an administrator with general information for troubleshooting some common problems that he (or she) may encounter while using IP phones. IP phones can provide feedback in a variety of forms such as log files, packets, status indicators and so on, which can help an administrator more easily find the system problem and fix it.
Page 250 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones 5: normal but significant condition 6: informational Procedure Log setting can be configured using the configuration files or locally. Configure the syslog mode. Parameters: syslog.mode Configure the IP address or domain name of the syslog server where to export the log files.
Page 251 Troubleshooting Parameters Permitted Values Default Settings->Configuration->Export System Log Phone User Interface: None IP address or syslog.server Blank domain name Description: Configures the IP address or domain name of the syslog server when exporting log to the syslog server. Example: syslog.server = 192.168.1.50 Note: It works only if the parameter “syslog.mode”...
Page 252 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones To configure the level of the system log via web user interface: Click on Settings->Configuration. Select the desired level from the pull-down list of System Log Level. Click Confirm to accept the change. The system log level is set as 6, the informational level.
Page 253 Troubleshooting A dialog box pops up to prompt “Do you want to restart your machine?”. The configuration will take effect after a reboot. Click OK to reboot the phone. The system log will be exported successfully to the desired syslog server after a reboot.
Page 254 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones purpose. To capture packets via web user interface: Click on Settings->Configuration. Click Start to start capturing signal traffic. Reproduce the issue to get stack traces. Click Stop to stop capturing. Click Export to open the file download window, and then save the file to your local system.
Page 255 Troubleshooting Configure span to PC Port. Navigate to: Local Web User Interface http://<phoneIPAddress/s ervlet?p=network-adv&q =load Details of the Configuration Parameter: Parameter Permitted Values Default network.span_to_pc_port 0 or 1 Description: Enables or disables the IP phone to span data packets received from the WAN (Internet) port to the PC (LAN) port.
Page 256 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Select Enabled from the pull-down list of Span to PC Port. Click Confirm to accept the change. A dialog box pops up to prompt that settings will take effect after a reboot. Click OK to reboot the phone.
Page 257 Troubleshooting ence&q=load Details of the Configuration Parameter: Parameter Permitted Values Default watch_dog.enable 0 or 1 Description: Enables or disables Watch Dog feature. 0-Disabled 1-Enabled If it is set to 1 (Enabled), the IP phone will reboot automatically when the system is broken down.
Page 258 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones indicators on SIP-T22P IP phones: If a LINK failure of the IP phone is detected, a prompting message “Network  unavailable” and the icon will appear on the LCD screen. If a voice mail is received, the MESSAGE key LED illuminates.
Page 259 Click Import to import the configuration file. This section describes solutions to common issues that may occur while using the IP phone. Upon encountering a scenario not listed in this section, contact your Yealink reseller for further support.
Page 260 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Do one of the following: Ensure that the IP phone is properly plugged into a functional AC outlet.  Ensure that the IP phone is plugged into a socket controlled by a switch that is on. ...
Page 261 Troubleshooting ’ Check if the IP phone is configured to obtain the time and date from the NTP server automatically. If your phone is unable to access the NTP server, configure the time and date manually. If you have poor sound quality/acoustics like intermittent voice, low volume, echo or other noises, the possible reasons could be: Users are seated too far out of recommended microphone range and sound faint, ...
Page 262 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones IP phones use the PoE preferentially. Auto provisioning refers to the update of IP phones, including update on configuration parameters, local phone book, firmware and so on. You can use auto provisioning on a single phone, but it makes more sense in mass deployment.
Page 263 Troubleshooting Reset your phone to factory configurations after you have tried all troubleshooting suggestions but do not solve the problem. Note that all custom settings will be overwritten after resetting. To reset the IP phone via web user interface: Click on Settings->Upgrade. Click Reset to Factory Setting in the Reset to Factory Setting field.
Page 264 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Capturing packets after you enable the RFC 2543 Hold feature. SDP media direction attributes (such as a=sendonly) per RFC 2543 is used in the INVITE message when placing a call on hold. Capturing packets after you disable the RFC 2543 Hold feature.
Page 265 Press the OK key when the IP phone is idle to check the firmware version. For example: 7.7.0.50. Item Description A unique digit used to identify the phone model. The unique digit for each IP phone model is: 35: SIP-T48G  7: SIP-T22(P)  Firmware generation. Note: The larger it is, the newer the firmware generation is.
Page 266 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones...
Page 267: Appendix
Appendix 802.1x--an IEEE Standard for port-based Network Access Control (PNAC). It is a part of the IEEE 802.1 group of networking protocols. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN. ACS (Auto Configuration server)--responsible for auto-configuration of the Central Processing Element (CPE).
Page 268 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones technological innovation and excellence. LAN (Local Area Network)--used to interconnects network devices in a limited area such as a home, school, computer laboratory, or office building. MIB (Management Information Base)--a virtual database used for managing the entities in a communications network.
Page 269 Appendix Time Zone Time Zone Name GMT−11 Samoa GMT−10 United States-Hawaii-Aleutian GMT−10 United States-Alaska-Aleutian GMT−9 United States-Alaska Time GMT−8 Canada(Vancouver, Whitehorse) GMT−8 Mexico(Tijuana, Mexicali) GMT−8 United States-Pacific Time GMT−7 Canada(Edmonton, Calgary) GMT−7 Mexico(Mazatlan, Chihuahua) GMT−7 United States-Mountain Time GMT−7 United States-MST no DST GMT−6 Canada-Manitoba(Winnipeg) GMT−6...
Page 270 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Time Zone Time Zone Name GMT0 United Kingdom(London) GMT0 Morocco GMT+1 Albania(Tirane) GMT+1 Austria(Vienna) GMT+1 Belgium(Brussels) GMT+1 Caicos GMT+1 Chad GMT+1 Spain(Madrid) GMT+1 Croatia(Zagreb) GMT+1 Czech Republic(Prague) GMT+1 Denmark(Kopenhagen) GMT+1 France(Paris) GMT+1...
Page 271 New Caledonia(Noumea) GMT+12 New Zealand(Wellington, Auckland) GMT+12:45 New Zealand(Chatham Islands) GMT+13 Tonga(Nukualofa) Yealink IP phones trust the following CAs by default: DigiCert High Assurance EV Root CA  Deutsche Telekom AG Root CA-2  Equifax Secure Certificate Authority  Equifax Secure eBusiness CA-1 ...
Page 272  Note Yealink endeavors to maintain a built-in list of most common used CA Certificates. Due to memory constraints, we cannot ensure a complete set of certificates. If you are using a certificate from a commercial Certificate Authority not in the list above, you can send a request to your local distributor.
Page 273: Sip Request
SIP Session Description Protocol (SDP) Usage  The following SIP request messages are supported: Method Supported Notes REGISTER Yealink IP phones support mid-call changes such as placing a call on hold as INVITE signaled by a new INVITE that contains an existing Call-ID.
Page 274 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Method Supported Notes Accept Alert-Info Allow Allow-Events Authorization Call-ID Call-Info Contact Content-Length Content-Type CSeq Diversion History-Info Event Expires From Max-Forwards Min-SE P-Asserted-Identity P-Preferred-Identity Proxy-Authenticate Proxy-Authorization RAck Record-Route Refer-To Referred-By Remote-Party-ID Replaces Require...
Page 275: Sip Responses
Appendix Method Supported Notes RSeq Session-Expires Subscription-State Supported User-Agent The following SIP responses are supported: In the following table, a “Yes” in the Supported column means the header is sent and Note properly parsed. The phone may not actually generate the response. 1xx Response—Information Responses 1xx Response Supported...
Page 276 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones 3xx Response Supported Notes 301 Moved Permanently 302 Moved Temporarily 4xx Response—Request Failure Responses 4xx Response Supported Notes 400 Bad Request 401 Unauthorized 402 Payment Required 403 Forbidden 404 Not Found 405 Method Not Allowed 406 Not Acceptable 407 Proxy Authentication...
Page 277 Appendix 4xx Response Supported Notes 485 Ambiguous 486 Busy Here 487 Request Terminated 488 Not Acceptable Here 491 Request Pending 493 Undecipherable 5xx Response—Server Failure Responses 5xx Response Supported Notes 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout 505 Version Not Supported...
Page 278 SIP 5xx—Server Failure Responses SIP 6xx—Global Failure Responses The following figure illustrates the scenario of a successful call. In this scenario, the two end users are User A and User B. User A and User B are located at Yealink SIP IP phones.
Page 279 Appendix The call flow scenario is as follows: User A calls User B. User B answers the call. User B hangs up. User A Proxy Server User B F1. INVITE B F2. INVITE B F3. 100 Trying F4. 100 Trying F5.
Page 280 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description in the Call-ID field. The transaction number within a  single call leg is identified in the CSeq field. The media capability User A is  ready to receive is specified.
Page 281 The following figure illustrates the scenario of an unsuccessful call caused by the called user’s being busy. In this scenario, the two end users are User A and User B. User A and User B are located at Yealink SIP IP phones. The call flow scenario is as follows: User A calls User B.
Page 282 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones The call cannot be set up successfully. User A Proxy Server User B F1. INVITE B F2. INVITE B F3. 100 Trying F4. 100 Trying F5. 486 Busy Here F6.
Page 283 The following figure illustrates the scenario of an unsuccessful call caused by the called user’s no answering. In this scenario, the two end users are User A and User B. User A and User B are located at Yealink SIP IP phones.
Page 284 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones The call flow scenario is as follows: User A calls User B. User B does not answer the call. User A hangs up. The call cannot be set up successfully. User A Proxy Server User B...
Page 285: Successful Call Setup And Call Hold
CANCEL request has been processed successfully. The following figure illustrates a successful call setup and call hold. In this scenario, the two end users are User A and User B. User A and User B are located at Yealink SIP IP phones.
Page 286 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones The call flow scenario is as follows: User A calls User B. User B answers the call. User A places User B on hold. User A Proxy Server User B F1.
Page 287 Appendix Step Action Description User A sends an INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 288 200 OK response. The following figure illustrates a successful call between Yealink SIP IP phones in which two parties are in a call, one of the participants receives and answers an incoming call...
Page 289 Appendix They are all using Yealink SIP IP phones, which are connected via an IP network. The call flow scenario is as follows: User A calls User B. User B answers the call. User C calls User B. User B accepts the call from User C.
Page 290 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description User A sends an INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 291 Appendix Step Action Description response notifies User A that the connection has been made. User A sends a SIP ACK to the proxy server, The ACK confirms that User A ACK—User A to Proxy Server has received the 200 OK response. The call session is now active.
Page 292 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description User C Ringing response to User C. User C hears the ring-back tone indicating that User A is being alerted. User A sends a mid-call INVITE request INVITE—User A to Proxy to the proxy server with new SDP Server...
Page 293 This is called a blind transfer. In this call flow scenario, the end users are User A, User B, and User C. They are all using Yealink SIP IP phones, which are connected via an IP network.
Page 294 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Call is established between User A and User C. User A Proxy Server User B User C F1. INVITE B F2. INVITE B F3. 180 Ringing F4. 180 Ringing F5.
Page 295 Appendix Step Action Description User A sends an INVITE message to the proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 296 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description connection has been made. User A sends a SIP ACK to the proxy server, The ACK confirms that User A ACK—User A to Proxy Server has received the 200 OK response. The call session is now active.
Page 297 This is called attended transfer. In this call flow scenario, the end users are User A, User B, and User C. They are all using Yealink SIP IP phones, which are connected via an IP network.
Page 298 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones User C answers the call. User A transfers the call to User C. Call is established between User B and User C. User A Proxy Server User B User C F1.
Page 299 Appendix Step Action Description User A sends an INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 300 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description connection has been made. User A sends a SIP ACK to the proxy server, The ACK confirms that User A ACK—User A to Proxy Server has received the 200 OK response. The call session is now active.
Page 301 Appendix Step Action Description The proxy server maps the SIP URI in the INVITE—Proxy Server to User To field to User C. The proxy server sends the INVITE request to User C. User C sends a SIP 180 Ringing 180 Ringing—User C to Proxy response to the proxy server.
Page 302: Always Call Forward
User C when User A calls User B. In this call flow scenario, the end users are User A, User B, and User C. They are all using Yealink SIP IP phones, which are connected via an IP network.
Page 303 Appendix User C answers the call. Call is established between User A and User C. User A Proxy Server User B User C F1. INVITE B F2. INVITE B F3. 302 Move Temporarily F4. ACK F5. 302 Move Temporarily F6. ACK F7.
Page 304 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description User A sends an INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of the User B is ...
Page 305: Busy Call Forward
200 OK response. The call session is now active. The following figure illustrates successful call forwarding between Yealink SIP IP phones in which User B has enabled busy call forward. The incoming call is forwarded to User C when User B is busy. In this call flow scenario, the end users are User A, User B, and User...
Page 306 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones C. They are all using Yealink SIP IP phones, which are connected via an IP network. The call flow scenario is as follows: User B enables busy call forward, and the destination number is User C.
Page 307 Appendix Step Action Description User A sends the INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 308 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description that the proxy server has received the ACK message. 302 Move Temporarily—Proxy The proxy server forwards the 302 Server to User A Moved Temporarily message to User A. User A sends a SIP ACK to the proxy server.
Page 309: No Answer Call Forward
User C when User B does not answer the incoming call after a period of time. In this call flow scenario, the end users are User A, User B, and User C. They are all using Yealink SIP IP phones, which are connected via an IP network.
Page 310 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description User A sends the INVITE message to a proxy server. The INVITE request is an invitation to User B to participate in a call session. In the INVITE request: The IP address of User B is inserted ...
Page 311 Appendix Step Action Description User B, the ACK message notifies User B that the proxy server has received the ACK message. 302 Move Temporarily—Proxy The proxy server forwards the 302 Server to User A Moved Temporarily message to User A. User A sends a SIP ACK to the proxy server.
Page 312 User B and User C. In this call flow scenario, the end users are User A, User B, and User C. They are all using Yealink SIP IP phones, which are connected via an IP network. The call flow scenario is as follows: User A calls User B.
Page 313 Appendix User A mixes the RTP channels and establishes a conference between User B and User C. User A User B User C Proxy Server F1. INVITE B F2. INVITE B F3. 180 Ringing F4. 180 Ringing F5. 200 OK F6.
Page 314 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description User A is identified as the call  session initiator in the From field. A unique numeric identifier is  assigned to the call and is inserted in the Call-ID field.
Page 315 Appendix Step Action Description server has received the 200 OK response. The call session is now active. User A sends a mid-call INVITE request INVITE—User A to Proxy to the proxy server with new SDP Server session parameters, which are used to place the call on hold.
Page 316 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones Step Action Description The proxy server forwards the 180 180 Ringing—Proxy Server to Ringing response to User A. User A User A hears the ring-back tone indicating that User C is being alerted. User C sends a SIP 200 OK response to 200OK—User C to Proxy the proxy server.
Page 317 Index Numeric 180 Ring Workaround Comfort Noise Generation 802.1X Authentication Configuration Files Configuration Methods Configuring Advanced features About This Guide Configuring Basic Features Account Lock Configuring Basic Network Parameters Acoustic Echo Cancellation Configuring Security Features Administrator Password Connecting the IP phone Allow Mute Always On Line Analyzing the Configuration Files...
Page 318 Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones In This Guide Reading Icons Index Redial Tone Initialization Process Overview Return Code When Refuse IPv6 Support Ringer Device for Headset Ring Tones Jitter Buffer Save Call Log Sign-in Key as send SIP Components Key Features of IP Phones...
Page 319 Index VLAN Voice Activity Detection Voice Mail without PIN Voice Quality Monitoring VoIP Principle Web Server Type Web User Interface...

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Yealink SIP-T48G Administrator's Manual

About this Guide

Table of Contents

Product Overview

Getting Started

Configuring Basic Features

Configuring Advanced Features

Configuring Audio Features

Configuring Security Features

Troubleshooting

Appendix

Quick Links

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