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The phone is a Polycom SoundPoint IP 301. I disabled all codecs other than G.729 on the phone's config page under Voice/Codecs--still no audio. The ITSP can't force G.711u. I'm not sure what else I can try.
-----Original Message-----
From: Robert Joly [mailto:rjoly@xxxxxxxxxx]
Sent: Thu 7/2/2009 1:14 PM
To: Matt Keys; sipx-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [sipx-users] ITSP call goes through but no audio
This could very well be the problem if the SIP phone you use does not
support asymmetric codecs nor does the lock-down procedure described in
Section 10.2 of RFC3264. To prove it, reconfigure your phone's
audio/rtp preferences to only use G.729. This will eliminate the
possibility of codec asymmetry - if the call now works, you have your
answer.
bob