Avaya IP Line User Manual Page 187

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Codecs Page 187 of 770
IP Line Description, Installation, and Operation
The following five codecs are actually registered:
1 G.711 mu-law (20 msec)
2 G.711 a-law (20 msec)
3 G.729A (30 msec)
4 T.38
5 G.711 Clear Channel
The G.729A codec is selected, as it precedes the G.723.1 codec in the order
of preference of the “best bandwidth” codecs.
Voice Gateway codec registration
The Voice Gateway registers codecs for the gateway channels as follows:
G.711 a-law and G.711 mu-law are always registered.
T.38 and G.711 Clear Channel fax codecs are always registered. G.711
Clear Channel is used for IP Trunk connections to BCM, which does not
support T.38 fax.
A minimum of two codecs are registered if only G.711 was configured.
A maximum of four codecs can be registered - the G.711 a-law and
mu-law for BQ codec, and some BB codecs (defined by the following
rules).
If the G.729A codec is configured, only the G.729A codec is
registered with the Call Server.
If the G.729AB codec is configured, the G.729A codec and the
G.729AB codec are registered with the Call Server.
If the G.723 codec is configured, the G.723 codec is registered with
the Call Server.
Example 1
G.711 a-law, G.729A, G.729AB, and G.723.1 are configured.
The Voice Gateway registers G.711 a-law, G.711 mu-law, G.729A, and
G.729AB.
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