Hi everyone, Disregard my last message, that was incorrect. I've think I've narrowed it down now, but I'm still not sure why this is happening. I'm seeing 100% CPU usage right after PJSUA writes 'Jitter buffer reset' to the log. This only happens once in a while, that's why I couldn't reproduce it properly. When the JB is not reset, 480s are handled just fine, just like everything else. What can I do to find out why this is happening? Is this a known issue? Please help me out here :) Thanks, Maarten P.S. The log is attached to this e-mail. -- Privateer Software Development (www.privateer-software.nl) * web usability, web accessibility, web development * cross-platform software development -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: jb-reset.txt URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090504/a9a0cd6e/attachment.txt>