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What would cause G729 over a PRI?

HEATH FREEL
Beginner
Beginner

Hi,

I am troubleshooting an ongoing issue with a customer on a call quality issue. I am sure this has nothing to do with it, but am confused as to why I would see two different codecs on a PRI... I ususally only see G711.

0/0/0:23.1      g711ulaw   n  S_CONNECT             
0/0/0:23.2      g729br8    n  S_CONNECT        

Thanks in advance.

Heath.

1 Accepted Solution

Accepted Solutions

This is showing you what the VoIP side of the call is using. The DSP has to convert the TDM signaling into one codec or another and this call negotiated G.729. This is either CUCM's doing (e.g. region configuration); or, the gateway choose a different dial-peer; the default is G.729 unless you specify otherwise on VoIP dial-peers.

Please remember to rate helpful responses and identify helpful or correct answers.

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2 Replies 2

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

There nothing but G.711 on PRis.

Maybe your gateway has negotiated G.729, check config.

This is showing you what the VoIP side of the call is using. The DSP has to convert the TDM signaling into one codec or another and this call negotiated G.729. This is either CUCM's doing (e.g. region configuration); or, the gateway choose a different dial-peer; the default is G.729 unless you specify otherwise on VoIP dial-peers.

Please remember to rate helpful responses and identify helpful or correct answers.

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