OK, I made a mistake when describing this issue. Caller B is earring caller A and caller C is earring caller B (but not A). Don't know if it will help someone to understand this. Any help will be very appreciated. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20160318/6d9136b9/attachment.html>