Hi , A small issues, But i seems to be challenging issuses to all, That... UAC are behind the NAT.. are hunging up automatically.. That caller is not hung up, callee is hung up after 32 seconds. And missed and rejecting call are working fine. I think , ACK session time out and is not requesting to openser . problem in openser.cfg with NAT or X-lite 3.0 softphones.. Problem in confiuration setting in softphones. Or Problem with router Gateways ( NETGEAR) from outbound to inbound. Bye Happpen Weakend ,,,,, Thanks and Regards with cheers Sunkara Ravi Prakash (Voip Developer && openSER) Hyperion Technology www.hyperion-tech.com