Multitech MultiVOIP MVP210 Configuration Manual
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Multitech MultiVOIP MVP210 Configuration Manual

Voice/fax over ip gateways deployed with avaya communication manager
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®
MultiVOIP
Voice/Fax over IP Gateways
Configuration Guide for
MultiVOIP Units deployed with
TM
Avaya
Communication Manager
Models:
MVP-130/210/410/810-AV

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Summary of Contents for Multitech MultiVOIP MVP210

  • Page 1: Voice /Fax Over Ip Gateways

    ® MultiVOIP Voice/Fax over IP Gateways Configuration Guide for MultiVOIP Units deployed with Avaya Communication Manager Models: MVP-130/210/410/810-AV...

  • Page 2: Configuration Guide

    Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes. Record of Revisions...

  • Page 3: Table Of Contents

    IP G OICE AX OVER ATEWAYS 1 - I ... 4 HAPTER NTRODUCTION About This Manual ... 4 MultiVOIPs in Avaya Communication Manager Systems ... 4 2 - C HAPTER ONFIGURATION Configuring MultiVOIP for Avaya Communication Manager Use ... 6 Regional Parameters screen ...

  • Page 4: Chapter 1 - Introduction

    MultiVOIP allows selected callers at a site remote from the Avaya PBX units to have access to the PBX units and all of their extensions without tolls. Voice and fax calls are supported. Chapter 1 - Introduction Multi-Tech Systems, Inc. Avaya Communication Manager Guide Communication Manager software...
  • Page 5 The following Avaya IP Phone models are supported in gatekeeper survivable mode: 4601 4602 4606 4610 9610 9620 9630 9640 1603 1608 1616 Multi-Tech Systems, Inc. Avaya Communication Manager Guide 4612 4620 4621 4624 4625 9650 Chapter 1 - Introduction...

  • Page 6: Chapter 2 - Configuration

    5) will be IP routed. If you require all calls to be IP routed, disable the “use TDM Routing for Intra-Gateway Calls” option. This should not normally be required, so it is recommended that you leave TDM Routing enabled. Chapter 2 - Configuration Multi-Tech Systems, Inc. Avaya Communication Manager Guide Communication...
  • Page 7 Note: This feature shall only be available on “AV” models of the gateway that are: Rev B: For the MVP410 and MVP810 models Rev B: For the MVP210 model Multi-Tech Systems, Inc. Avaya Communication Manager Guide RTP Port RTCP Port...
  • Page 8 2c. Enable the “Message Waiting Light” feature if you have FXS Interface selected and are using an Avaya analog telephone with Message Waiting indicator or enable “Stutter Dial Tone” if you are screen of the MultiVOIP GUI. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 9 MultiVOIPs analog station port. b) Similarly, the following features must be enabled as desired: • Switchhook flash • Call Waiting Indication • Attendant Call Waiting Indication Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration...
  • Page 10 “phone number” field. Enabling this feature allows an analog phone user to be able to lift his/her Bandwidth per Channel Voice Frames per IP Packet 40K bps 24K bps 18K bps 96K bps 80K bps 74.7K bps Multi-Tech Systems, Inc. Avaya Communication Manager Guide screen, configure the voice channels for a 16K bps 72K bps...
  • Page 11 Communication Manager. Typically, it is OK to use the default values 1721-1728 on channels 1-8 respectively. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Communication Manager Parameters Communication Manager MultiVOIP: FXS Channels Chapter 2 - Configuration screen.
  • Page 12 4d. Configure Phone Number / Extension. This must match the extension configured for this station in the Communication Manager “station” form. If “ Message Waiting Indicator” is required for this extension, set this option to “led” in the CM “station” form. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 13 Communication Manager software for that PBX. If you are using the MultiVOIP Gatekeeper as an alternate gatekeeper, enter the IP address of the MultiVOIP. The alternate MultiVOIP gatekeeper must appear after any Communication Manager alternate gatekeepers. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration...
  • Page 14 Chapter 2 – Configuration 5. Configure trunk (FXO) channels in the Communication Manager Parameters screen. Communication Manager MultiVOIP: FXO Channels 5a. Make sure the “Register with Communication Manager Gatekeeper” option is checked. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 15 Communication Manager software for that PBX. If you are using the MultiVOIP Gatekeeper as an alternate gatekeeper, enter the IP address of the MultiVOIP. The alternate MultiVOIP gatekeeper must appear after any Communication Manager alternate gatekeepers. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration = h.323...
  • Page 16 For example, if four channels of an MVP810-AV are configured as FXO, four trunk group numbers must be listed, as above. Dial Access? Service Type = tie Group Type = ISDN Carrier Medium = IP/H.323 Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 17 Chapter 2 - Configuration 6. Configure trunk (DID) channels in the Communication Manager Parameters screen. Communication Manager MultiVOIP: DID Channels 6a. Make sure the “Register with Communication Manager Gatekeeper” option is checked. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 18 Communication Manager software for that PBX. If you are using the MultiVOIP Gatekeeper as an alternate gatekeeper, enter the IP address of the MultiVOIP. The alternate MultiVOIP gatekeeper must appear after any Communication Manager alternate gatekeepers. = h.323 Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 19 Communication Manager Trunk Group form (“Change Trunk-Group” dialog box). For example, if four channels of an MVP810-AV are configured as DID, four trunk group numbers must be listed, as above. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Dial Access? Service Type = tie...
  • Page 20 “Phones” field to 1000 to route incoming FXO trunk calls to a given FXS station to cover the autocall situation in Gatekeeper Survivable mode. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 21 MultiVOIP. Leave the other fields blank. Only one entry is required for one or more ports on a given MultiVOIP. For example, if the MultiVOIP has four DID ports, only one gatekeeper entry should be added. Click OK to accept this entry. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration...
  • Page 22 Definity CLAN IP address. The MultiVOIP IP address must be listed at the end of the string. MCIPADD=xxx.xxx.xxx.xxx,yyy.yyy.yyy.yyy where xxx.xxx.xxx.xxx is one or more IP addresses used for Definity/CM CLAN IP boards and yyy.yyy.yyy.yyy is the MultiVOIP’s IP address. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 23 MultiVOIP unless you are using CM 2.0.1 or higher. 7g. The completed Endpoints screen is shown below: 7h. Click on Save Setup|Save GK Parameters to save the gatekeeper settings. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration...
  • Page 24 911 calling for emergencies. 8a. Go to the MultiVOIP’s Phone Book | Phone Book Modify | Outbound Phone Book | List Entries screen as seen below. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 25 Centrex service, you would enter this in the Add Prefix field. Leave the Total Digits and Q.931 Port Number fields set to 0. Leave all other fields blank. Click OK to accept the changes. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 26 Enter the digit pattern of 9612 in the Destination Pattern field. Enter the digit 9 in the Remove Prefix field. 8e. Add additional Outbound Phone Book entries for calls to the 651 and 952 exchanges as indicated in the screens below: Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 27 8f. Add an Outbound Phone Book entry to handle the routing of 911 emergency calls to the FXO trunk. Since 911 must be dialed out the FXO trunk, leave the Remove Prefix field blank. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 28 The call with digits 7637174321 is routed to the FXO predefined endpoint registered with Name = Minneapolis-FXO. The FXO trunk port activates its tip/ring loop-start interface and the digit string “7637174321” is dialed out towards the network. When the called party of 7637174321 answers, the call is completed. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 29 The MultiVOIP gatekeeper searches the Phones fields of the predefined Endpoints and finds a match for 2110. The MultiVOIP gatekeeper routes the call to the IP phone registered with the phone number 2110. When IP phone 2110 answers, the call is completed. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 2 - Configuration...

  • Page 30: Regional Parameters Screen

    Higher frequency of pair. Amplification factor of lower frequency of pair. This applies to the dial, ring, busy and ‘unobtainable’ tones that the MultiVOIP outputs as audio to the FXS, FXS, or E&M port. Default: -16dB Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 31 To access this customization feature, click on the Custom button on the Regional Parameters screen. (The “Custom” button is active only when “Custom” is selected in the Country/Region field.) Multi-Tech Systems, Inc. Avaya Communication Manager Guide “Regional Parameter” Definitions Continued Description Amplification factor of higher frequency of pair.
  • Page 32 Cadence 3 is duration of second “on” period in signaling cadence. Cadence 4 is duration of second “off” period in the signaling cadence, after which the 4-part cadence pattern of the telephony signal repeats. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 33: Chapter 3 - Related Multivoip Setup Parameters

    Channel n FXS Loop Start; “Interface Type FXO; DID is …” Multi-Tech Systems, Inc. Avaya Communication Manager Guide Description Denotes the VOIP channel to which settings in the current screen apply. Indicates the telephony interface used on the selected VOIP channel.
  • Page 34 It is optional for the system to have a PBX that serves as a first alternate gatekeeper. It is optional for the system to have a PBX that servers as a second alternate gatekeeper. Multi-Tech Systems, Inc. Avaya Communication Manager Guide “Register with is enabled, this field defaults to is enabled, this...
  • Page 35 (Tun) Parallel H.245 (FS + Tun) Annex –E (AE) Multi-Tech Systems, Inc. Avaya Communication Manager Guide Description The MultiVOIP sends this value to CM in the Registration Request (RRQ). However, the MultiVOIP will send “Keepalive” RRQs based on the TTL received from CM during Registration Confirm (RCF) Enable/disable MultiVOIP’s Gateway Survivable mode wherein...

  • Page 36: Voice/Fax Parameters

    Chapter 3 – Related MultiVOIP Setup Parameters Voice/Fax Parameters In each field, enter the values that fit your particular network. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 37 Voice Gain Input Gain +31dB to –31dB Output Gain +31dB to –31dB Multi-Tech Systems, Inc. Avaya Communication Manager Guide Voice/Fax Parameter Definitions Description When this button is clicked, all Voice/FAX parameters are set to their default values. Channel to be configured is selected here.
  • Page 38 When Automatic is selected, the local and remote voice channels will negotiate the voice coder to be used by selecting the highest bandwidth coder supported by both sides without exceeding the Max Bandwidth setting. G.723, G.729, or G.711 are negotiated. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 39 Compression Echo Cancellation Forward Error Correction Multi-Tech Systems, Inc. Avaya Communication Manager Guide Voice/Fax Parameter Definitions Continued Description (cont’d) Select from a range of coders with specific bandwidths. The higher the bps rate, the more bandwidth is used. The channel that you are calling must have the same voice coder selected.
  • Page 40 Optimization Factor adjustment controls how quickly the length of the Jitter Buffer is increased when jitter increases on the network. The length of the jitter buffer directly effects the voice delay between gateways. Multi-Tech Systems, Inc. Avaya Communication Manager Guide MultiVOIP...
  • Page 41 Network 1 to 65535 seconds; Discon- Default = 30 sec. nection Multi-Tech Systems, Inc. Avaya Communication Manager Guide Voice/Fax Parameter Definitions (cont’d) Description (cont’d) The minimum dynamic jitter buffer of 60 milliseconds is the minimum delay that would be acceptable over a low jitter network.

  • Page 42: Interface Parameters

    Chapter 3 – Related MultiVOIP Setup Parameters Interface Parameters In each field, enter the values that fit your particular network. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 43 Interface parameters for a particular channel, you can apply this entire set of Voice/FAX parameters to another channel by using the Copy Channel button and its dialog box. To copy a set of Interface parameters to all channels, select “Copy to All” and click Copy. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 44 When enabled, the MultiVOIP will interrupt loop current in the FXS circuit to initiate a disconnection. This tells the device connected to the FXS port to hang up. The Multi-VOIP cannot drop the call; the FXS device must go on hook. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 45 (cont’d) The Caller ID feature has dependencies on both the telco central office and the MultiVOIP phone book. See discussion after the FXO Parameters section below. Multi-Tech Systems, Inc. Avaya Communication Manager Guide Description not applicable to FXS interface .
  • Page 46 FXO interface. In other words, this is the minimum length of time the current must be absent to validate ‘current loss’ as a disconnection criterion. Default = 500 ms. Disconnection to be triggered by a tone sequence. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 47 Caller ID fields Caller ID Type Bellcore Caller ID enable Multi-Tech Systems, Inc. Avaya Communication Manager Guide FXO Interface: Parameter Definitions (cont’d) Description These are DTMF tone pairs. Values for first tone pair are: *, #, 0, 1-9, and A-D.

  • Page 48: Voip System

    Use as default entry Remove Prefix: Add Prefix: Channe l Numbe r: Time: 1747 Description: enters SPP voip system Multi-Tech Systems, Inc. Avaya Communication Manager Guide Call originates here at 1:42pm, May 31. Central Office with standard telephony xxxyyyzzzz J.Q. Public...
  • Page 49 DID line can handle only one call at a time. The parameters described here pertain to the customer- premises side of the DID connection (DID-DPO, dial-pulse originating); the network side of the DID connection (DID-DPT, dial-pulse terminating) is not supported. Multi-Tech Systems, Inc. Avaya Communication Manager Guide CID Flow Terminating...
  • Page 50 Not applicable to DID-DPO interface. This parameter is applicable when digits are dialed onto a DID-DPO channel after the connection has been made. The length of time between the outputting of DTMF digits. Default = 100 ms. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 51: Gk General Settings

    0-100 Buttons Memory Settings Multi-Tech Systems, Inc. Avaya Communication Manager Guide GK General Settings Definitions Description When selected, sets a policy whereby the Gatekeeper accepts no registrations. When selected, sets a strict zone policy, in which the Gatekeeper accepts only registrations that arrive from predefined endpoints.
  • Page 52 The timeout (in seconds) waiting for the Connect message of a call. Logical port through which Q.931 protocol messages are handled. Default value = 1730 Invokes default values for all parameters on the GK General Settings screen. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 53: Gatekeeper - Endpoints

    An endpoint’s registration can be static (essentially permanent) or dynamic (timed or conditional). The fields of the Existing Endpoints screen are described in the table below. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 54 Deletes the endpoint from the Gatekeeper database. A URQ will not be sent to the endpoint. Deletes the predefined (static) properties of the endpoint. Opens the Online properties screen or the selected endpoint whereupon are shown details of that endpoint’s configuration. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 55: Gatekeeper - Calls

    Disconnect Call (button) Disconnect All (button) Call Details Multi-Tech Systems, Inc. Avaya Communication Manager Guide Current Calls Field Definitions Description Number. A sequential number for identification in the list. Originating IP Address. IP Address of endpoint originating the call. Originating Alias. The first alias given by the call’s origin. The H.323 ID alias of the endpoint originating the call.
  • Page 56 As a call-management service, the gatekeeper can change the routing of the call (by line hunting) while the calls is in progress. If the gatekeeper is to implement supplementary (H.450) services, it must operate in routed mode. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 57 Signaling IP Req. Bandwidth App. Bandwidth Multi-Tech Systems, Inc. Avaya Communication Manager Guide Call Details Field Definitions (Cont’d) Description The total amount of bandwidth used by the call. The type of conference request: create, invite or join. The last reported state of the call.
  • Page 58 This is the phone number of the called endpoint on the remote LAN. It is used for calls between multiple gateways. This is the identifier (name) of the called endpoint on the remote LAN. It is used for calls between multiple gateways. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 59: Gatekeeper - Network Parameters

    Registered Current BW number Usage Configuration Options Alias Giving Multi-Tech Systems, Inc. Avaya Communication Manager Guide Network Parameter Definitions Description button to refresh the Status Information fields. Update The number of current calls with the Gatekeeper. The number of endpoints registered with the Gatekeeper.
  • Page 60 Delayed return of call-proceeding message to originating endpoint. When selected (in routed mode), the gatekeeper will send a Q.931 call- proceeding message to the originating endpoint after it receives a return call-proceeding message back from the destination endpoint. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 61 Registration TO (hrs) IRQ Interval (sec) Multi-Tech Systems, Inc. Avaya Communication Manager Guide Network Parameter Definitions (cont’d) Description Sets the call mode to direct. In this mode, terminals send ARQ messages to the Gatekeeper, but pass the call signaling and media control signaling directly between them.
  • Page 62 The Gatekeeper responds only to Discovery requests that either contain a matching Gatekeeper identifier or have no Gatekeeper identifier. Click to update information in the “Status Information” fields of the Network Parameters screen. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 63: Gatekeeper - Services

    GK Defined Services Prefix Description Default Public Multi-Tech Systems, Inc. Avaya Communication Manager Guide Services Screen Definitions Description A prefix that identifies the service. A description of the service that is accessible by dialing the prefix. See “GK Defined Service Types” section on following pages.
  • Page 64 (dynamic). This field indicates whether the service has been added manually (non-dynamically; field value =N) or dynamically (field value = Y) as part of registration from endpoints. These buttons allow you add, edit, or delete a selected service or prefix. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 65: Chapter 4 - Miscellaneous

    Outbound Destination Pattern 6001 6002 6003 6004 6005 6006 8001 9303 9720 Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 4 - Miscellaneous A Comm Mgr Example MultiVOIP Phonebook Remove Add Prefix Prefix 8001 6001 IP Address 204.26.122.1 204.26.122.1 204.26.122.1 204.26.122.1...
  • Page 66 5. When the called party of 5380000 answers the call, the call is completed. Add Prefix 6001 6002 6003 6004 6005 6006 9303 9303 9720 9720 Multi-Tech Systems, Inc. Avaya Communication Manager Guide Chapter 4 – Miscellaneous Channel to direct call toward...

  • Page 67: Remote Configuration

    Verify that the Select Port box is set for the COM port of your local PC and that the Baud Rate is set to 115200. In Modem Setup, the modem Initialization String, Initialization Response, and Connect Response should be configured as shown in the above dialog box. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 68 13. If the same telephone number is not going to be used again in the immediate future, you may want to remove it from the Port Setup dialog box. Chapter 4 – Miscellaneous Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 69: Information

    MVP130-AV Rev A MVP130-AV-FXS Rev A MVP210-AV Rev A MVP210-AV Rev B MVP410-AV Rev A MVP410-AV Rev B MVP810-AV Rev A MVP810-AV Rev B Multi-Tech Systems, Inc. Avaya Communication Manager Guide Interfaces Supported Configuration Modem FXS/FXO FXS/FXO/DID FXS/FXO FXS/FXO/DID FXS/FXO...
  • Page 70 For example, a MVP810-AV may have Revision C printed on the packaging label and PCB, but display “MVP810-AV Rev B” in System Information. This means no new features were added in Rev C and it supports the same features as the Rev B (FXS/FXO/DID). Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 71: Link Management

    Address, No of Pings Sent, No of Pings Received, Round Trip Delay (Min/Max/Avg), and last Error. You can compare the number of pings sent/received and Round Trip Delay to determine the condition of the network between the two units. Ping tests are discontinued when you exit the Link Management screen. Multi-Tech Systems, Inc. Avaya Communication Manager Guide...

  • Page 72: Feature Issues

    FXO port that was routed by CM. This is due to CM sending “Unknown Name” in the Display field of the Q.931 setup message instead of the actual Caller ID Name received by the MultiVOIP FXO port. Chapter 4 – Miscellaneous Multi-Tech Systems, Inc. Avaya Communication Manager Guide...
  • Page 73 URL ... 58 Phone Numbers ... 58 Remote Extension Name ... 58 Remote Extension Phone ... 58 Multi-Tech Systems, Inc. Avaya Communication Manager Guide Index Req. Bandwidth ... 58 Call Details gatekeeper (Source Info) screen fields App. Bandwidth ... 57 Call Signalling IP ...
  • Page 74 (with gatekeeper) ... 61 Dynamic gatekeeper field (Services, V2 GW Prefixes) ... 64 Dynamic Jitter Buffer field analog ... 41 Dynamic Jitter fields analog ... 41 e164 aliases ... 58 Echo Cancellation field Multi-Tech Systems, Inc. Avaya Communication Manager Guide Index...
  • Page 75 ... 38 FXO Disconnect On fields ... 46 FXO disconnection criteria ... 46 FXO disconnection, triggering of ... 46, 47 Multi-Tech Systems, Inc. Avaya Communication Manager Guide FXO Interface Parameter definitions ... 46, 47 FXO Interface Parameter fields Current Loss... 47 Current Loss Detect Timer ...
  • Page 76 Group Type field ... 16, 19 H.245 Tunneling field ... 35 H.320 ... 64 H.323 aliases ... 57, 58, 64 H.323 Annex E field... 35 H.323 coder analog ... 39 in band, DTMF Multi-Tech Systems, Inc. Avaya Communication Manager Guide Index...
  • Page 77 Names gatekeeper field (Call Details, Destination Info) ... 58 Names gatekeeper field (Call Details, Source Info) ... 57 neighbor gatekeepers ... 62 Network Disconnection field Multi-Tech Systems, Inc. Avaya Communication Manager Guide analog ... 41 Network Parameters (gatekeeper) screen accessing ... 59 Update button ...
  • Page 78 Type (of tone) field ... 30 Type field (gatekeeper) ... 54 UDP multiplexed (H.323 Annex E) field ... 35 unobtainable tone, custom ... 31, 32 unobtainable tones ... 31 Unregister All endpoints command Gatekeeper ... 54 Multi-Tech Systems, Inc. Avaya Communication Manager Guide Index...
  • Page 79 ... 37, 38 Voice/FAX Parameter fields (analog) Copy Channel ... 37 Default ... 37 Multi-Tech Systems, Inc. Avaya Communication Manager Guide DTMF Gain ... 37 DTMF Gain (High Tones) ... 37 DTMF Gain (Low Tones) ... 37 DTMF In/Out of Band ... 37 Duration (DTMF) ...

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