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Grandstream Networks GRP260X Series Administration Manual

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Grandstream Networks, Inc.
GRP260X SERIES – Administration GUIDE

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  • Page 1 Grandstream Networks, Inc. GRP260X SERIES – Administration GUIDE...

  • Page 2: Product Overview

    GRP2603/GRP2604 offers an easy-to-use and easy-to-deploy voice endpoint. The GRP260X series delivers superior HD audio quality, rich and leading-edge telephony features, protection for privacy, and broad interoperability with most 3rd party SIP devices and leading SIP/NGN/IMS platforms. GRP260X series is the perfect choice for enterprise users looking for a high-quality, feature-rich multi-line executive IP phone with advanced functionalities and performance.

  • Page 3: Technical Specifications

    Technical Specifications The following table resumes all the technical specifications including the protocols/standards supported, voice codecs, telephony features, languages, and upgrade/provisioning settings for the GRP260X series. SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS(A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR-069, SNMP, 802.1x, TLS,...
  • Page 4 Layer 2 QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS User and administrator level passwords, MD5 and MD5-sess based authentication, 256-bit AES encrypted Security configuration file, SRTP, TLS, 802.1x media access control, secure boot. English, Chinese, Korean, Japanese, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Greek, Multi-language and more Firmware upgrade via FTP/TFTP / HTTP / HTTPS, mass provisioning using GDMS/TR-069 or AES...
  • Page 5 Base Stand Yes, 1 angle positions available Wall Mountable Yes, (*wall mount sold separately) Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS User and administrator level passwords, MD5 and MD5-sess based authentication, 256-bit AES encrypted Security configuration file, SRTP, TLS, 802.1x media access control, secure boot English, Chinese, Korean, Japanese, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Greek, Multi-language...
  • Page 6 HD audio Yes, HD handset and speakerphone with support for wideband audio Base Stand Yes, 2 angle positions available Wall Mountable Yes, (*wall mount sold separately) Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS User and administrator level passwords, MD5 and MD5-sess based authentication, 256-bit AES encrypted Security configuration file, SRTP, TLS, 802.1x media access control, secure boot English, Chinese, Korean, Japanese, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Greek...

  • Page 7: Getting Started

    800 records), off-hook auto dial, auto answer, click-to-dial, flexible dial plan, hot-desking, personalized music ringtones and music on hold, server redundancy and fail-over HD audio Yes, HD handset and speakerphone with support for wideband audio Base Stand Yes, 2 angle positions available Wall Mountable Yes, (*wall mount sold separately) Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS...

  • Page 8: Using The Slots For Wall Mounting

    Figure 1: GRP260X Package Content Note Check the package before installation. If you find anything missing, contact your system administrator. GRP260X Phone Setup The GRP260X phones can be installed on the desktop using the phone stand or attached to the wall using the slots for wall mounting.
  • Page 9 Figure 3: Tab on the Handset Cradle Connecting the GRP260X To set up the GRP260X, follow the steps below: 1. Connect the handset and main phone case with the phone cord. 2. Connect the LAN port of the phone to the RJ-45 socket of a hub/switch or a router (LAN side of the router) using the Ethernet cable.

  • Page 10: Configuration Via Keypad

    Figure 4: GRP260X Back Side View Configuration via Keypad To configure the LCD menu using the phone’s keypad, follow the instructions below: Enter MENU options. When the phone is in idle, press the round MENU button or Menu Softkey to enter the configuration menu.
  • Page 11 Jabra EHS, Sennheiser EHS. • Advanced settings ��Upgrade Check for upgrade by contacting the firmware upgrade server. • Syslog Configures Syslog level, Transport protocol and Syslog Server’s address. • Security Enables disables Web and SSH access. • Alternative Firmware Press softkey to switch between the dual firmware versions loaded to the phone. The phone will reboot with the chosen version.

  • Page 12: Configuration Via Web Browser

    Figure 5: GRP260x LCD settings Configuration via Web Browser The GRP260X embedded Web server responds to HTTP/HTTPS GET/POST requests. Embedded HTML pages allow a user to configure the IP phone through a Web browser such as Google Chrome, Mozilla Firefox, and Microsoft’s IE. To access the Web GUI: 1.

  • Page 13: Saving Configuration Changes

    User Level User Password Web Pages Allowed Only Status and Basic End User Level user Settings Random password available on the Administrator Level admin Browse all pages sticker at the back of the unit. When changing any settings, always SUBMIT them by pressing the “Save” or “Save and Apply” button at the bottom of the page.
  • Page 14 SIP Server Displays the configured SIP Server address, URL or IP address, and port of the SIP server. SIP Registration Displays SIP registration status for the SIP account. Status �� Network Status Global unique ID of device, in HEX format. The MAC address will be used for provisioning and can be found MAC Address on the label coming with original box and on the label located on the back of the device.

  • Page 15: Account Page Definitions

    Service Status GUI, Phone and CPE service status. System Information Download system information User Space Shows the percentage of the user space used and the status of the Database Shows the status of the core dump and the core dump files generated if any. It also gives the ability to generate Core Dump GUI/Phone core dump files manually.
  • Page 16 UCM User Password Input UCM user login password to connect UCM user settings. Network Settings This parameter controls how the Search Appliance looks up IP addresses for hostnames. If “Use Configured IP” is selected, please fill in Primary IP, Backup IP 1 and Backup IP 2. ●...
  • Page 17 used. “STUN” cannot be used if the detected NAT is symmetric NAT. Set this to “VPN” if OpenVPN is used. Configures to use symmetric response routing. If it is used, the "rport" field will be added to the Via header field in the SIP Request, and the information will be extracted Support rport (RFC3581) from the SIP 200OK Response for SIP Register to rewrite the SIP Contact information and apply it in subsequent SIP Requests.
  • Page 18 When set to “Yes”, a SUBSCRIBE for Registration will be sent out periodically. SUBSCRIBE for Registration The default setting is “No”. Configures whether the “Privacy Header” is present in the SIP INVITE message. ● Default: the phone will add “Privacy Header” when special feature is not “Huawei IMS”. Use Privacy Header ●...
  • Page 19 ● If set to “Dual (Secured)“, phone will listen to TLS/TCP when UDP is selected. If “TCP” or “TLS/TCP” is selected, UDP will be listened too. ● If set to “Dual (BLF Enforced)“, phone will try to enforce BLF subscriptions to use TCP protocol by adding ‘transport=tcp’...
  • Page 20 If set to “Yes” and the remote party supports session timers, the phone will use a session timer when it makes outbound calls. Caller Request Timer The default setting is “No”. If set to “Yes” and the remote party supports session timers, the phone will use a session timer when it receives inbound calls.
  • Page 21 2. RFC2833 sends DTMF with RTP packet. Users can check the RTP packet to see the DTMFs sent as well as the number pressed. 3. SIP INFO uses SIP INFO to carry DTMF. Default setting is “RFC2833”. Configures the payload type for DTMF using RFC2833. Cannot be the same as iLBC or DTMF Payload Type OPUS payload type.
  • Page 22 Configure RTCP port negotiation rules. ● Default: Use the traditional RTCP port, which is "RTP port+1". ● Negotiate RTCP Port: Use attribute RTCP to negotiate. RTCP Mode ● RTCP Mux: The caller actively negotiates the RTCP port and indicates RTCP Mux at the same time.
  • Page 23 Configures the call waiting function for this account. If set to “Default”, it will be configured Enable Call Waiting according to global call waiting function. Default value is “Default”. Allows users to toggle between RFC2543 hold and RFC3261 hold. RFC2543 hold (0.0.0.0) RFC2543 Hold allows user to disable the hold music sent to the other side.
  • Page 24 Configures the DTMF sequence sent when pressing the Recording key during a call on this Call Recording Off account when turning recording off. Transfer Configures whether the call is transferred to the other party if the conference initiator hangs Transfer on Conference Hangup The default setting is “No”.
  • Page 25 ● Contacts ● Call History Incoming Call ● Call History Outgoing Call ● Dialing Page ● MPK ● API Configures the dial plan rule. For syntax and examples, please refer to user manual for more details. Dial Plan Rules: 1. Accepted Digits: 1,2,3,4,5,6,7,8,9,0, *, #, A,a,B,b,C,c,D,d; 2.
  • Page 26 Ringtone Ringback Tone at No Early Media Play ringback tone when there is no receiving early media RTP packets. Disabled by Default Allows users to configure the ringtone for the account. Users can choose from different ringtones from the dropdown menu. Account RingTone Note: User can also choose silent ring tone or doorbell.
  • Page 27 Allow SIP Notification message to perform factory reset. Allow SIP Reset The default setting is “No”. If set to “Yes”, the phone will challenge the incoming INVITE for authentication with SIP 401 Unauthorized response. Authenticate Incoming INVITE The default setting is “No”. On Hold Reminder Tone Configures to play reminder tone when the call is on hold.
  • Page 28 Configures the interval (in seconds) when the line-seize is considered timed out when Shared Line-Seize Timeout Call Appearance feature is used. Valid range is 15 to 60. Call Park Call Park Feature Code Configure the feature access code for parking current call to parking lot or another extension. Call Park Retrieve Feature Code Configure the feature access code for retrieving the parked call on accounts or BLF keys.
  • Page 29 DND Call Feature Off Configures DND feature code to turn off DND. Call Forward Always Configures Call Forward Always feature code to activate unconditional call forwarding. Configures Call Forward Always feature code to deactivate unconditional call forwarding. Target The extension the call will be forwarded to. Call Forward No Answer Configures Call Forward No Answer feature code to activate no answer call forwarding.
  • Page 30 The NAT IP address used in SIP/SDP messages. This field is blank at the default settings. It should ONLY be used if it Use NAT IP is required by your ITSP. Delay Configures specific time that the account will be registered after booting up. Registration Enable Outbound...
  • Page 31 Preferred Select the preferred default account for on-hook or off-hook dialing. When the selected account is unavailable, system Default Account will use the first available account to dial out. Select "Mute" key function while the phone is idle. Mute Key ●...
  • Page 32 Onhook Dial When the option is set to "Disabled", onhook dialing won't be interrupted by an incoming call. Barging Off-hook Auto Configures the digits to be dialed via the first account when the phone is off-hook. Dial Off-hook Auto Configures the digits to be dialed via the first account when the phone is off-hook. Dial Delay Off-hook/On- If configured, when the phone is in the off-hook or on-hook dialing state, it will go idle after the timeout (in seconds).
  • Page 33 Auto Answer Configures the delay for automatically answering the incoming call. Valid range is 0 to 10 (seconds) Delay In Call Enable In-call When set to "No", the DTMF digits entered during a call will not be displayed on LCD. DTMF Display Enabled by Default.
  • Page 34 The default setting is off. Override DND Configure the number to override the local DND function. Numbers Conference Enable Enables the conference feature Conference Configures whether to put the current call on hold while adding new members to a conference. If set to "Yes", the current call will be put on hold when the host presses conference or add key to invite new members.
  • Page 35 ● Busy Tone ● Reorder Tone Provision Total Number of Configures the number of custom ringtones to update in the provisioning process. Custom Default Value is 6. Ringtone Update Phone settings -> Multicast Paging Multicast Paging Enable or disable multicast paging Function Allow Multicast Paging when DND mode is enabled.
  • Page 36 Vendor Class ID (Option 60) Used by clients and servers to exchange vendor class ID. IPv4 Address Enter the IP address when static IP is used. Subnet Mask Enter the Subnet Mask when static IP is used for IPv4. Gateway Enter the Default Gateway when static IP is used for IPv4.
  • Page 37 Uploads / deletes the 802.1X CA certificate to the phone; or delete existed 802.1X CA 802.1X Client Certificate certificate from the phone. Network Settings �� Wi-Fi Settings (GRP2602W Only) Enables / Disables the Wi-Fi on the phone. Three options are available: ●...
  • Page 38 Selects the encryption type of the OpenVPN® TLS key. it can be set to : TLS-Auth, TLS- OpenVPN® TLS Key Type Crypt, TLS-Crypt V2 Specifies the Cipher method used by the OpenVPN® server. The available options are: ● Blowfish ● AES-128 ●...
  • Page 39 value is 0 Defines the MTU in bytes. The valid range is 576 – 1500. Maximum Transmission Unit (MTU) The default value is 1500 bytes. PC Port Mode Configure the PC port mode. When set to “Mirrored”, the traffic in the LAN port will go PC Port Mode through PC port as well and packets can be captured by connecting a PC to the PC port.
  • Page 40 noAuthUser: Users with security level noAuthnoPriv and context name as noAuth. Security Level AuthUser: Users with security level authNoPriv and context name as auth. AuthUser: Users with security level authNoPriv and context name as auth. SNMP Username Username for SNMPv3. Authentication Protocol Select the Authentication Protocol: “None”...
  • Page 41 Presence Watcher: ● This option has to be supported by a presence server and it is tied to the “Do Not Disturb” status of the phone’s extension. Eventlist BLF: ● This option is similar to the BLF option but in this case the PBX collects the information from the phones and sends it out in one single notify message.
  • Page 42 Message: ● Select this feature in order to display the Message menu from the MPK buttons, no field dis required for configuration. Forward: ● Set the MPK Button to perform call forwarding to the destination number configured on the “Value Field”. During ringing press the button to perform the call forward.
  • Page 43 ● Dial DTMF ● Voice Mail ● Call Return ● Transfer ● Call Park ● Intercom ● LDAP Search ● Conference ● Multicast Paging ● Call Log ● Monitored Call Park ● Menu ● Information ● Messages ● Forward ● DND ●...
  • Page 44 ● Custom softkey layout when the device is under CALL CONNECTED state. ● Available softkeys: End Call, Conference, New Call, Swap, Transfer, call park, Send DTMF, Call Record, End Record, Noise shield, Call Hold, BS Call Center, GDS Opendoor, Group Listen, Cancel Specified transfer On Hold State: ●...
  • Page 45 Date and Time Defines the URL or IP address of the NTP server. The phone may obtain the date and time from the server. The NTP Server default setting is “pool.ntp.org”. Secondary NTP Defines the URL or IP address of the NTP server. The phone may obtain the date and time from the server. Allow Server user to configure 2 NTP server domain names.
  • Page 46 System Settings → Input Method To set the input method for contacts, default value: 123 input method. Input Method for language.inputMethod.contacts Contacts Rule: include:"123","abc","ABC","Ab2","Q9"Default: 123 To set the LDAP input method, default value: 123 input method. Input Method for language.inputMethod.ldap LDAP Rule: include:"123","abc","ABC","Ab2","Q9"Default: 123 System Settings ��...
  • Page 47 Web Access Only allow the IP address list as a whitelist or restrict the IP address list as a blacklist to access the Web. Control List Web Session Configures timer to logout web session during idle. The valid range is 2-60 min. The default value is 10 min Timeout Administrator can disable or enable user web access.
  • Page 48 SIP TLS SSL Certificate used for SIP Transport in TLS/TCP. Certificate SIP TLS Private SSL Private key used for SIP Transport in TLS/TCP. SIP TLS Private SSL Private key password used for SIP Transport in TLS/TCP. Key Password Custom The uploaded custom certificate will be used for SSL/TLS communication instead of the phone default certificate. Certificate CA Signature This feature allows users to configure CA signature algorithm.
  • Page 49 Enable Missed If set to “Yes”, the LCD backlight will be turned on when there is a missed call on the phone. Call Backlight The Default value is "Yes" Configures the LED indicator mode when there is a new voicemail or text message on the phone. If set to “Off”, the New Message LED indicator will not light up.
  • Page 50 Configures enabling/disabling the speaker to ring when the headset is used on "Toggle Headset/Speaker" mode. it Always Ring can be set to "No", "Yes, Both" or "Yes, Speaker Only", Speaker The Default Value is "Yes, Both" Group Listen Allow handset to be able to listen when picked up during a call with headset. with handset Disabled by Default.

  • Page 51: Maintenance Page Definitions

    System Settings �� TR-069 Enable TR-069 Enables TR-069 URL for TR-069 Auto Configuration Servers (ACS). ACS URL Default setting is: https://acs.gdms.cloud TR-069 Username ACS username for TR-069. TR-069 Password ACS password for TR-069. Periodic Inform Enables periodic inform. If set to “Yes”, device will send inform packets to the ACS. The default setting is “Yes”. Enable Sets up the periodic inform interval to send the inform packets to the ACS.
  • Page 52 Firmware Defines the server path for the firmware server. Server Path Firmware Server The username for the firmware server. Username Firmware Server The password for the firmware server. Password Firmware File If configured, only the firmware with the matching encrypted prefix will be downloaded and flashed into the phone. Prefix Firmware file If configured, only the firmware with the matching encrypted postfix will be downloaded and flashed into the phone.
  • Page 53 Config Server The username for the HTTP/HTTPS server. Username Config Server The password for the HTTP/HTTPS server. Password Always Authenticate Only applies to HTTP/HTTPS. If enabled, the phone will send credentials before being challenged by the server. Before Challenge Config File Enables your ITSP to lock configuration updates.
  • Page 54 The default setting is “None”. Config Provision Download and By default, device will provision the first available config in the order of cfgMAC, cfgMAC.xml, cfgMODEL.xml, Process ALL cfg.xml and devMAC.cfg (corresponding to device specific, model specific, and global configs). If set to Yes, device Available will download and apply (overwrite) all available configs in the same order.
  • Page 55 Note: By setting Send SIP Log to Yes, the phone will still send SIP log from syslog even when Syslog Level set to NONE. Packet Capture With RTP Defines whether the packet capture file contains RTP or not. The default setting is “No”. Packets With Secret Key Configures whether the packet capture file contains secret key information or not.
  • Page 56 Call Operation Off-hook Configures the Action URL to send when phone is in off-hook state. On-hook Configures the Action URL to send when phone is in on-hook state. Incoming Calls Configures the Action URL to send when phone receives an incoming call. Outgoing Calls Configures the Action URL to send when phone places a call.
  • Page 57 Close Forward Configures the Action URL to send when phone disables call forward always function. Always Open Call Configures the Action URL to send when phone disables call forward always function. Forward Busy Close Call Configures the Action URL to send when phone disables call forward busy function Forward Busy Open Call Forward No...
  • Page 58 Message Configures the message body or the outbound notification. Extra Attribute Configure extra attribute’s name reserved for specific attributes for a given notification in the future. Name Extra Attribute Configures extra attribute’s value reserved for specific attributes for a given notification in the future. Value Maintenance ��...
  • Page 59 during non-working hours, set forward during working hours. Scheduled Tasks Configures a new shceduled task based on : ● Scheduled Tasks Type: Select the type of scheduled task: Scheduled Reboot, Scheduled lock, or Scheduled Forward, Set to Scheduled Reboot by Default. ●...
  • Page 60 Edit Group Edits selected group. Delete Group Delete Selected group. Phonebook Management Configures to enable phonebook XML download. Users could select HTTP/HTTPS/TFTP to download the Enable Phonebook phonebook file. XML Download The default setting is “Disabled”. HTTP/HTTPS The username for the HTTP/HTTPS server. Username HTTP/HTTPS The password for the HTTP/HTTPS server.
  • Page 61 Import LDAP Sets the option to Import the LDAP configuration file, if activated, The original LDAP file will be overwritten. configuration file Local Configuration Configures the LDAP protocol to LDAP or LDAPS. The default setting is “LDAP”. LDAPS is a feature to LDAP Protocol support LDAP over TLS.
  • Page 62 Specifies the “number” attributes of each record which are returned in the LDAP search result. This field allows the users to configure multiple space separated number attributes. LDAP Number Example: Attributes telephoneNumber telephoneNumber Mobile Configures the entry information to be shown on phone’s LCD. Up to 3 fields can be displayed. LDAP Display Name Example: %cn %sn %telephoneNumber...
  • Page 63 External Service Page Definitions External Service �� GDS Connect to a GDS37XX and send OpenDoor request. ● Service Type: Select GDS as service type. ● Account: The account to be used on the phone to interact with the GDS37XX. ● System Identification: A name or a number to identify the GDS37XX. ●...
  • Page 64 Service Settings Sort Phonebook by Sort phonebook based on the selection of first name or last name. BroadSoft Directory Update Interval Configures the BroadSoft phonebook download interval (in minutes). If set to 0, automatic download will be disabled. Valid range is 5 to 4320. The maximum contacts that can be downloaded for each BroadSoft XSI server directory.

  • Page 65: Nat Settings

    Location Server Username Configure the user name of the primary Location Information Server (LIS) Location Server Password Configure the password of the primary Location Information Server (LIS) Secondary Location Server Configure the seconary Location Information Server (LIS) address Secondary Location Server Username Configure the user name of the secondary Location Information Server (LIS) Secondary Location Server Password Configure the password of the secondary Location Information Server (LIS)

  • Page 66: Upgrading And Provisioning

    Figure 6: Packet Capture in Idle Users can also define whether RTP packets will be captured or not from With RTP Packets option. When the capture configuration is set, press the Start button to start packet capture. The Status will become RUNNING while capturing, as shown in Figure 7: Packet Capture when running.

  • Page 67: Firmware Upgrade

    Firmware Upgrade The GRP260X series can be upgraded via TFTP / FTP / FTPS / HTTP / HTTPS by configuring the URL/IP Address for the TFTP / HTTP / HTTPS / FTP / FTPS server and selecting a download method. Configure a valid URL for TFTP, FTP/FTPS, or HTTP/HTTPS, the server name can be FQDN or IP address.

  • Page 68: Phone Provisioning

    When the GRP260x series boots up or reboots, it will issue a request to download an XML file named “cfgxxxxxxxxxxxx.xml”, where “xxxxxxxxxxxx” is the MAC address of the phone, i.e., “cfg000b820102ab” and “cfg000b820102ab.xml”. If the download of the “cfgxxxxxxxxxxxx.xml”...
  • Page 69 *212 -- Config upgrade via *234 -- Config prefix *235 -- Config postfix *237 -- Config upgrade Server *240 – Authenticate Config File *1359 – XML Config File Password *8463 – Validate Server Certificate *8467 – Download and process ALL Available Config Files *20713 –...

  • Page 70: No Touch Provisioning

    2. Phone found there is change(s) compared with the current setting on the phone (Any valid P-value change, no matter if it does need reboot to apply or not). 3. The phone will update to the new setting (will not save P22421 itself) and will go into the normal reboot process (e.g.: if there is an active call, the phone will wait until it is finished) Second-time download: 1.

  • Page 71: Restore Factory Default Settings

    RESTORE FACTORY DEFAULT SETTINGS Warning Restoring the Factory Default Settings will delete all configuration information on the phone. Please backup or print all the settings before you restore them to the factory default settings. Grandstream is not responsible for restoring lost parameters and cannot connect your device to your VoIP service provider.
  • Page 72 Added Support to disable speaker phone [Phone Settings Page Definitions] Added Support of OpenVPN® Client Key Password [Network Settings Page Definitions] Added Support to customize Early media response [Account Page Definitions] Firmware Version 1.0.3.70 Added Support of Weak Cipher Suites. [System Settings Page Definitions] Firmware Version 1.0.3.63...
  • Page 73 Added Support of Show SIP Error Response feature [Show SIP Error Response] Added Support of Enable Hook Switch feature [Enable Hook Switch] Added Support of Contact Source Priority feature [Contact Source Prioriy] Added Support of Direct IP Call [Enable Direct IP Call] Added Support of Use Quick IP Call Mode [Use Quick IP Call Mode] Added Support of Predictive Dialing Feature [Predictive Dialing Feature] Added Support of Predictive Dialing Source [Predictive Dialing Source]...
  • Page 74 Grandstream Networks, Inc. is not permitted. Grandstream is a registered trademark and the Grandstream logo is the trademark of Grandstream Networks, Inc. in the United States, Europe, and other countries.
  • Page 75 20 cm between the radiator and your body. CE Authentication Hereby, Grandstream Networks, Inc. declares that the radio equipment GRP2602W are in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address:...
  • Page 76 GNU GPL INFORMATION GRP260x firmware contains third-party software licensed under the GNU General Public License (GPL). Grandstream uses software under the specific terms of the GPL. Please see the GNU General Public License (GPL) for the exact terms and conditions of the license. Grandstream GNU GPL-related source code can be downloaded from the Grandstream website from: http://www.grandstream.com/sites/default/files/Resources/grp260x_gnu_gpl.zip Need Support?

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