Forgot to mention, I am using the GSM codec. On Thu, Aug 12, 2010 at 11:56 AM, Kapil Pendse <kapil.pendse at gmail.com>wrote: > 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 > -- "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/20100812/0061fd42/attachment.html>
