Dear All, I'm trying to send FAX to an endpoint Behind NAT...The scenario i the following: PSTN_GW-->Asterisk-->kamailio-->Endpoint behind NAT.. The FAX is failed and I got the following error log on asterisk: Mar 20 09:21:09] WARNING[20388]: chan_sip.c:12409 handle_response_invite: Re-invite to non-existing call leg on other UA. SIP dialog '76c64f8373def68d5088690816c67493@Asterisk_IP'. Giving up On kamilio everything looks great except the received value in the INVITE message...I guess it should be the Public IP of the endpoint and not asterisk IP address... Can you please help me in order to find the real issue? the log is under http://pastebin.com/d1e7ba841 Regards