Hi, I've got an issue trying to register a Polycom IP320 against FS 1.0.1, as below the Polycom is coming from and registering with a contact port 5076, however FS is sending the 401 to port 5060. Any ideas? I have a Snom registering successfully as 1000 from behind a different NAT. Any ideas? # U 203.23.223.109:5076 -> 4.53.88.29:5060 REGISTER sip:4.53.88.29 SIP/2.0. Via: SIP/2.0/UDP 192.168.1.1;branch=z9hG4bK7db8749a8ECDE4D3. From: "Craig Guy" <sip:1001@4.53.88.29>;tag=914B0517-5EB6FA00. To: <sip:1001@4.53.88.29>. CSeq: 1 REGISTER. Call-ID: 7ef2a3fc-a794db15-262aa31e@192.168.1.1. Contact: <sip:1001@203.23.223.109:5076>;methods="INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER". User-Agent: PolycomSoundPointIP-SPIP_320-UA/2.1.2.0049. Max-Forwards: 70. Expires: 3600. Content-Length: 0. . # U 4.53.88.29:5060 -> 203.23.223.109:5060 SIP/2.0 401 Unauthorized. Via: SIP/2.0/UDP 192.168.1.1;branch=z9hG4bK7db8749a8ECDE4D3;received=203.23.223.109. From: "Craig Guy" <sip:1001@4.53.88.29>;tag=914B0517-5EB6FA00. To: <sip:1001@4.53.88.29>;tag=7U95e600jSH5e. Call-ID: 7ef2a3fc-a794db15-262aa31e@192.168.1.1. CSeq: 1 REGISTER. User-Agent: FreeSWITCH-mod_sofia/1.0.1-exported. Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH. Supported: 100rel, timer, precondition, path, replaces. WWW-Authenticate: Digest realm="4.53.88.29", nonce="b59a58b1-bdc6-4487-b346-12838168039d", algorithm=MD5, qop="auth". Content-Length: 0. .