Hi, I'm using TCP to make REGISTER. TCP will create a connection between us and registrar server. 1. How to check if our registration stills valid on registrar ?? (to let other clients to not see the "Not found" message when calling us) 2. How to check if this TCP connection is still alive ?? (If this connection is broken, server will not be able to send us INVITE) -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130410/2d4ae19e/attachment-0001.html>