LevelOne VOI-8001 - Manual (Page 65)

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z Silence Detection / Suppression:
Enable or disable the Silence Detection/VAD function. When Enable, if local
gateway detect a silence situation ( no talk), it will send a VAD package rather
than a full voice package for remote side to active CNG ( Comfort Noise
Generation) to save the bandwidth. The default is Enable to save the
bandwidth.
z Prefer CODEC :
In this table, you can define the prefer CODEC. The priority 1 selection is
highest priority. By different CODEC, user can select different payload size
per package as below:
„ G.711 uLaw: 20,30,40,50,60,70,80ms
„ G.711 aLaw: 20, 30,40,50,60,70,80ms
„ G.723.1: 30,60,90ms
„ G.729a: 20,30,40,50,60,70,80ms
„ G.726:
20,30,40,50,60,70,80ms
„ None: none
The gateway will calculate and show approximately bandwidth for one VoIP
call.