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...al office extensions (which still go through asterisk) OR voicemail 2) The other 20+ phones in the same office on the same network have 0 problems. Here's a SIP trace of the problem. yyy.yyy.yyy.yyy is the outside NAT IP xxx.xxx.xxx.xxx is the IP of my PBX dddddddddd is the dialed phone number sssssssssss is the source phone number The peculiar thing is that asterisk sends an OK in response to an INVITE, then the phone sends back an ACK, which asterisk seems to ignore because it retransmits the OK message again Then eventually the phone gives up and sends a BYE message. -- James <--- SIP rea...