hello I'm using pjsip version 1.0 . after registering to the server and When I send a subscribe to the remote server I receive 200 Ok with the request notify The problem is , the callback on_rx_notify is not called as described in the developer's guide The guide say : this callback is optional when it not implemented , the default behavior is to respond incoming notify with 200 OK. I tried to use other callback like : on_tsx_state , on_evsub_state those callback are called. The problem still in the on_rx_notify Thanks for helping me . -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100504/c9de93fc/attachment.html>