I am pulling my hair out trying to get an AUdiocodes MP-108 FXO gateway to register. I set it up like some of my other phones but keep getting errors. Here is the SIP debug. Any pointers would be appreciated. 10 headers, 0 lines Message is NOTIFY Sip read: REGISTER sip:216.139.32.179 SIP/2.0 Via: SIP/2.0/UDP 216.139.30.77;branch=z9hG4bKacgKAyfjp From: <sip:281@sipgate1>;tag=1c25733 To: <sip:281@sipgate1> Call-ID: 12321281312813zYsl@216.139.30.77 CSeq: 208177 REGISTER Expires: 180 Contact: <sip:281@216.139.30.77;user=phone>;expires=180 Content-Length: 0 9 headers, 0 lines Using latest request as basis request Sending to 216.139.30.77 : 5060 (non-NAT) Transmitting (no NAT): SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP 216.139.30.77;branch=z9hG4bKacgKAyfjp From: <sip:281@sipgate1>;tag=1c25733 To: <sip:281@sipgate1>;tag=as4fe5fd3a Call-ID: 12321281312813zYsl@216.139.30.77 CSeq: 208177 REGISTER User-Agent: Asterisk PBX Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER Contact: <sip:281@216.139.32.179> Content-Length: 0