05-14-2009 11:24 AM - edited 03-15-2019 06:01 PM
Hi All,
If your gateway is MGCP and your service parameter to advertise G.729 annex-b, which is the default, you will not be able to hear audio on 12.4(24)T.
Becoming kind of a hot bug, thought I would let you know.
Details:
CSCsy10653
Symptom:
Calls on an MGCP gateway negotiating g729br8 may fail to have audio in one or both directions.
Conditions:
This occurs on MGCP gateways with the fix for CSCsu66759 when g729br8 is being negotiated.
Workaround:
Any of the following will be sufficient to get around this issue:
1. Configure the gateway for static payload type using the following commands on the gateway:
mgcp behavior g729-variants static-pt
mgcp behavior dynamically-change-codec-pt disable
2. Disable g729br8 from being negotiated for this call. If CUCM is involved, this is done with the service parameter 'Strip G.729 Annex B (Silence Suppression) from Capabilities'
3. Downgrade to IOS code on the gateway which does not contain the fix for CSCsu66759, which would be 12.4(22)T and below.
hth,
nick
05-21-2009 05:12 AM
Thanks Nick,
Saved me hours of frustration and a TAC case.
08-19-2009 05:58 AM
FYI, Upgraded to 12.4(22)T2 per the "Fixed-In" comments and it did the exact same thing, still required the two mgcp behavior lines to have audio.
So in 12.4(22)T2 it is NOT fixed yet.
Thanks,
Frank
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