Hi all, I am developing a VoIP client for Windows using VS2008. I have purchased the Intel IPP package and have added and linked the codecs properly(with some trouble I might add). When I use 2 instances of the client on my PC and make calls using AMR its working fine. The error scenario is that I receive a call from the IMS server to which I am already registered. The media is handled by the MGW(Kindly check the below message diagram): IMS -------------------------------------(INVITE)------------------------------->Client IMS <-------------------------------(100 Trying)-------------------------------Client MGW <-------------------(RTCP Recvr Report) --------------------------Client IMS<--------------------------------(200 OK)----------------------------------Client MGW <-------------------(AMR-WB packet) -----------------------------Client IMS -------------------------------------(ACK)---------------------------------->Client IMS -------------------------------------(BYE)---------------------------------->Client (Reason: Q.850; cause=111[Protocol Error, unspecified]) IMS<--------------------------------(200 OK)----------------------------------Client MGW <--------------(RTCP Sender Rep Goodbye) ------------------Client The problem I see immediately is that the MGW is not sending me any packets, which it should and does when I use PCMU/A codec. With PCMA, the MGW sends me both RTCP and PCMA RTP packets without any problems. So for some reason, on using the Intel IPP codecs, the MGW stops liking my client. This is my estimate, though something else could be wrong as well. I have extensive wireshark and PJSUA logs of both successful and failed scenarios. So if any of that would help, please tell me. I didn't want to write a humungous e-mail on the first go :) Regards, Arjun