We are using the 1.0.x series so that may explain why we don't see the fix for ticket #1033. I had read that ticket yesterday and it did sound somewhat familiar. Christian ------------------------------ Message: 4 Date: Fri, 19 Feb 2010 11:29:01 +0000 From: Benny Prijono <bennylp@xxxxxxxxx> To: pjsip list <pjsip at lists.pjsip.org> Subject: Re: Exception when timeout timer fires on pending transaction Message-ID: <49a4be81002190329v77721c92g5a198c7e3b8b995e at mail.gmail.com> Content-Type: text/plain; charset=windows-1252 Hi, which PJSIP version are you using, and what platform? I tried this with the latest SVN trunk on Linux and couldn't reproduce it. There was a similar issue which has been fixed in SVN trunk, ticket #1033, so it may have fixed it too. Cheers Benny