Hi all, I am a fresh man here. Any help will be appreciated! In the sample code, we can see that "[self performSelectorOnMainThread:@selector(keepAlive) withObject:nil waitUntilDone:YES];?" Could I schedule the "keepAlive" in a non-main thread? Thanks in advance!! ------------------ Regards, Albert -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20140912/50d62ea8/attachment.html>