Hey, Post successful registration, on trying to make a call, pjsua2 is setting up a new TCP connection with the server, and sending out the INVITE from a port that's different from the one that it REGISTER-ed with. Due to this, the server is rejecting the INVITE, as the <IP:PORT> does not match that of the registered user. And all this while, the TCP connection that was established during registration is kept alive. Could someone tell me how I can ensure that the INVITE-s and future SIP transactions are made over the existing connection? Thanks, - Vishnu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20151117/67a7a67b/attachment.html>