Hello Everyone, I am trying to register a contact where-in Server wants Register to be sent on a different port other than standard port for second register when proxy sends 401. 1st Register - Send to 5060 of Server (Client also sends port on which it expects 200 Ok, say 6003) 401 - Server sends with new port(say 5002) on which it expects to receive second Register with Challenge response. 2nd Register- Send to 5002 of Server 200 Ok - Server sends back response to 6003. I was able to bind to two transports at PJSIP Client, by using pjsua_transport_create(). But when i try to change the dest port for 2nd REGISTER, pjsip doesnt send to new port. I changed the destination port in get_dest_info() function of sip_util.c. Appreciate anyone help me on this. -Dhar. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120605/53f63d6c/attachment.html>