no audio using g729A for Cisco AS5300 sip peer

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Hi,

We need help in enabling g729a codec for our SIP peer that’s using Cisco
AS5300.
Our codec is purchased from Digium.

We are able to dial out the numbers and answer the call, but there’s no
audio. This is when only g729a is allowed.

We noticed when they also allow ulaw codec on their side, the codec used
falls back to ulaw and the problem is gone.