[cisco-voip] CCM 4.1(3) SIP Trunk + Codec

[tusker keg]

Hellos

I am trying to configure a sip trunk between a callmanager and OpenSer
SIP Server.

I am able to send calls through successfully with G711a/ulaw codec (
these are the only  2 options  under sip trunks  configuration page) .

When I put the SIP server in a different region  and change the audio
codec for communicating
with the region with callmanager , the calls fails.,

Are other codecs supported in sip trunks,
Any workarounds?

Regards

./Tusker