Hello everyone, I'm using pjsip-1.5.5. Compiled one copy for Windows Mobile running on Sony Xperia X1 phones. Compiled another copy for Windows XP laptop. I've modified the 'pjsua' apps slightly such that there are 4 phones that call in to this one laptop. The laptop, joins them all in a conference. All of this over WiFi. Audio goes through well and all phones are able to communicate with each other. But there is this echo on each phone. Whatever is spoken in phone-1 is echoed back to phone-1 after about 1~2 seconds (after it is heard on the other phones). The laptop's mic and speakers are muted, and port 0 of laptop is NOT connected to the rest of the conference. All phones are equipped with headset, so that the backpanel 'speakerphone' is NOT being used. Conference bridge connections: phone-1 - port 3 = transmitting to ports 4,5,6 phone-2 - port 4 = transmitting to ports 3,5,6 phone-3 - port 5 = transmitting to ports 3,4,6 phone-4 - port 6 = transmitting to ports 3,4,5 I tried to use the Echo cancellation algorithm (ec-tail=default 256). Also tried smaller values of ec-tail. But the moment I use anything other than ec-tail=0, the phone's just can't handle it. The app bogs down the CPU and audio becomes horrible. The app's UI stops responding. So I'm guessing the algorithm is too heavy for the cellphone CPU. I saw in a post that there was a lighter "echo suppression" algorithm available, but didn't figure out where in the code it was. Is that the default anyway? What could be done to get around this echo problem? Any help and suggestions would be appreciated. Thanks and best regards, Kapil -- "The Power to Imagine, is The Power to Create!" -TTux -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100812/f399f6db/attachment.html>
