Hi, Not sure if it's related to http://trac.pjsip.org/repos/ticket/1571, but I'm getting a deadlock when opening the preview window from PJSUA. Here is a backtrace of all involved threads: https://gist.github.com/saghul/6378975 I was thinking on using the job queue also on OSX, but with a single thread, so all operations would be serialized and then that thread would block when running the jobs in the main thread. This way, the threads which post the jobs would not need to wait until they are finished. Thoughts? Thanks! -- Sa?l Ibarra Corretg? AG Projects