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Disabling VAD on Cisco VGW

Posted on 2011-04-21
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Last Modified: 2012-05-11
Hi,
We have a cisco vgw connected to a PRI line for testing.
A call generator on the lan side sends SIP calls to PSTN destinations.
On the return path (from pstn to lan), we always see gaps in the rtp stream that indicate the cisco is using silence suppression. How to turn that off?
On calls in the other direction, we disable it in the dial-peer with 'no vad' on the voice peer for the sip destination.
Thanks!
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Question by:JerryNorton
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decoleur earned 2000 total points
ID: 35974708
my understanding is that VAD only applies to outbound calls and would apply to both sides of a call only if both endpoints are on-net.

you can turn off VAD completly by using the commands as applied to the dspfarm. See:http://www.cisco.com/en/US/docs/ios/voice/command/reference/vr_v1.html#wp1152769

hope this helps,

-t
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Author Closing Comment

by:JerryNorton
ID: 35974913
well, truth be told, there is a default dial-peer that is used to match incoming ip calls. we had to make an explicit one and then we could put 'no vad' in that. The override here looks good, but not sure it applies to our model of the gateway. giving points because it looks right.
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Author Comment

by:JerryNorton
ID: 35974918
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