Altigen AltiContact Manager Version 4.6, Administration Manual

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VoIP Configuration
AltiContact Manager Administration Manual 9-5
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Setting VoIP Codecs
The default codec for static IP extensions is G.711, which gives a
bandwidth of approximately 64 kbps. This is appropriate for lease lines or
high-speed connections. The default codec for dynamic IP extensions is
G.723, which gives a bandwidth of approximately 6.4 kbps. This is
appropriate for internet connections.
• G.711/G.723 compression and bandwidth requirements:
(for example, a Multilink Point-to-Point Protocol (MLPPP) or Frame
Relay Forum (FRF), with no Voice Activity Detection (VAD)
running)
— G711 10ms packet frame = 100.8 kbps
— G711 20ms packet frame = 82.4 kbps
— G711 30ms packet frame = 76.3 kbps
— G723 30ms packet frame 6.4k rate = 18.7 kbps
If you are running G.723.1 compression, you should reserve 17 kbps
WAN link bandwidth for each channel.
You can change these defaults and set dynamic IP addressing ranges and
codecs for AltiContact Manager-to-AltiContact Manager connections
using the VoIP Codec Configuration window.
To open the VoIP Codec Configuration window:
• Select the VoIP Configuration... from the System Management
menu and select the VoIP Codec Configuration tab. Or,
• Use the drop-down list next to the System icon, select VoIP
Configuration... and select the VoIP Codec Configuration tab.