Hi, I recently posted to the list about forcing a particular codec along the path of a call and transcoding the voicepath, http://lists.digium.com/pipermail/asterisk-users/2004-October/065218.html, to which I've been able to tame, thanks to the help of the list. I now have a new problem- When I place a call from my grandstream, I hear a distorted ringback. Once the call is answered, everything sounds fine. sip0 an * box which handles registreation and pbx functions. sip1 is the pstn gateway with pri interfaces. Setup is as follows: (iLBC) (ulaw) +--------+ +--------+ +--------+ | gs | <-----> | sip0 | <-----> | sip1 | +--------+ +--------+ +--------+ Nothing is allowed to reinvite in this scenerio, the call path is exactly as you see above. Has anyone run into a problem like this with a similar setup? - Eric