Cannot configure codec g729a & g729ab in Cisco AS5350XM

Answered Question
Jun 1st, 2008

Why I cannot configure the codec g729a & g729ab at dial-peer voice or voice codec class in AS5350XM.

I noticed in the datasheet in this link for IP-IP GW,

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6790/gatecont/ps5640/product_data_sheet09186a00801da698.html

all codec for G729 are supported.

I have this problem too.
0 votes
Correct Answer by Paolo Bevilacqua about 8 years 7 months ago

In some models you configure that under voice-cards. Others support flexi complexity and it's all automatic. You are never presented the choice of annex a or not with cisco gateways.

However, if you're using SIP, there are special cases:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t11/feature/guide/ftcodec.html

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Paolo Bevilacqua Fri, 06/06/2008 - 13:47

Hi, g.729a is an alternative algorithm and doesn't change compressed format, so is compatible and transparent for use with a non-a endpoint.

You choose which one is actually used with "codec complexity".

G.729b is the variation with embedded vad and would run as g.729ab depending on the codec complexity as above.

Hope this helps, please rate post if it does!

noxkrugger Fri, 06/06/2008 - 14:05

What do u mean by codec compelxity? I cannot choose or configured any of that either high or medium in the voice gateway. How to achieve that?

Correct Answer
Paolo Bevilacqua Fri, 06/06/2008 - 14:27

In some models you configure that under voice-cards. Others support flexi complexity and it's all automatic. You are never presented the choice of annex a or not with cisco gateways.

However, if you're using SIP, there are special cases:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t11/feature/guide/ftcodec.html

As an appreciation to those providing answers, please rate useful posts with the scrollbox below!

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