Also - we have disabled VAD and set EC tail to 0. That disables Echo Cancellation correct? Thanks, Patrick Greene From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of Patrick Greene Sent: Wednesday, August 27, 2008 5:11 PM To: pjsip at lists.pjsip.org Subject: Questions about Audio Quality Hey Guys - I really really hate using the lists unless I have absolutely exhausted documentation and existing threads, but I'm in a situation where we are getting audio quality issues and I can't seem to track it down. We are using version .9 of the PJSIP library. We are using the pjsua_lib library to create a soft phone for use within a Win32 .NET framework application by compiling it in a managed C++ wrapper library. The application is run on Win32/XP boxes. The problems we are having seem to be very bad quality audio primarily on outgoing calls and in the inbound RTP direction (user of soft phone hears poor audio quality, other side of RTP is ok). We have experienced this on a couple of different PBX platforms including Trixbox and 3-com's SIP PBX both exhibiting similar characteristics. We have tried different headsets and just using the PC speakers all with similar results. The codec being used is g711u, but this occurs on others as well. The audio sounds very scratchy, choppy, jittery and almost metallic. We have set the audio quality in the media config to 10 and no improvement. I guess the question I have is what information can we gather to help troubleshoot this process. I notice a ton of buffer size changes in the debug log, but that may be normal activity. Thanks for any help, pointers, etc. that someone can provide. Sincerely, Patrick Greene Software Engineer Evo Technologies -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080827/61c62a43/attachment.html
