Hi, By examining the pjsip-ua layer providing the client registration (regc), we notice that no locking mechanism is used. It seems that this can cause some potential risks if we are using worker threads as the reception callback or the timer can access the regc structure at the same time that the regc APIs. Other layers, such as the invite or xfer use the lock of the underlying dialog. Philippe Leuba eyeP Media SA -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20071114/a37062aa/attachment.html