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Chapter 2 – Configuration
10 Multi-Tech Systems, Inc. Avaya Communication Manager Guide
3. Configure Voice/Fax Parameters.
3a. In the MultiVOIP’s
Configuration | Voice/Fax Parameters screen, configure the voice channels for a
voice coder that is supported by Communication Manager.
The voice coder selected must match the voice coders listed in the ip-codec-set for the network
region the MultiVOIP resides in. If only G.729 is listed in the ip-codec-set, select G.729 on the
MultiVOIP. If G.711 is listed before G.729 in the ip-codec-set, select G.711, G.729 on the MultiVOIP.
If G729 is listed before G.711 in the ip-codec-set, select G.729, G.711 on the MultiVOIP.
There is one exception, if only G.711 is listed in the ip-codec-set, you must select G.711, G.729 on
the MultiVOIP. This will allow support for G.711 for CM managed calls, and will allow support for
G.729 for survivable mode calls. The MultiVOIP only supports G.729 in survivable mode.
The table below shows the bandwidth required per voice channel based on the codec selected and
the CM “Frames per Packet” setting in the “Change IP-Codec-Set” screen.
Bandwidth per Channel
Voice Frames per IP Packet
Coder 1 2 3 4
G.729 40K bps 24K bps 18K bps 16K bps
G.711 96K bps 80K bps 74.7K bps 72K bps
3b. If the CM customer desires that a particular FXS port is to operate as a “hot extension”, set the
“auto call/off-hook alerting” feature to auto call and enter the desired destination number in the
“phone number” field. Enabling this feature allows an analog phone user to be able to lift his/her