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Codec issues with OCS pbxnsip and SIP trunks


Doug
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Hi we are testing pbxnsip with OCS and Exchange. I believe I heard OCS will only use the 711 codec. I have OCS pointing to pbxnsip as the gateway. Then pbxnsip points to the SIP trunks .

 

The issue is being able to use G729 codec on the trunk from pbxnsip to the carrier.

 

Our trunk carrier can give preference to 729 over 711. We want to save bandwidth so we want whenever possible to use 729.

 

So I set the trunks from pbxnsip to the carrier to prefer 729 then 711.

 

If I make a call from a phone connected to pbxnsip all audio quality seems fine. The carrier says it is using 729.

 

If I make a call from Communicator out the inbound audio is fine but the person I call says it sounds very bad. The carrier says it is using 711.

 

Since I am codec impaired I really need to know how to specify the codec to use on the trunks so the OCS communicators sound as good as the voip phones.

 

What are the correct settings to use?

 

Thanks,

 

Doug

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