Hi Benny, here is the situation: UserA and UserB are not friends. UserB is offline. UserA add and request presence subscription to UserB. When UserB logged in, The callback on_incoming_subscription is not called. <- the problem If UserA will send another request while UserB is online, the callback is called. Thanks, Joseph -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080818/31c837bd/attachment.html