So, it is a bug then? Should I give CoreAudio a try? If so, how do I tell it to use CoreAudio? The echo cancelation stuff, I just leave it as default if it's enabled and set ec_tail_len to 0 if it is disabled. I do not notice a difference with the echo when I change that higher or lower. Yes I am on 10.6.4 if you needed to know. Thanks for trying to help me solve this issue, Mr. Gecko On Oct 10, 2010, at 10:25 PM, Ming wrote: > Hi, > > Well, according to the stack log, you are already using PA. > 6 pjsip 0x000a4d3b PaPlayerCallback + 134 > 7 pjsip 0x001736e2 AdaptingOutputOnlyProcess + 249 > 8 pjsip 0x00174599 PaUtil_EndBufferProcessing + 1113 > > The EC should work regardless of the sound device backend you use. > > Regards, > Ming -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 4657 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20101010/a1d235c3/attachment.p7s>