Sorry, if this question has been asked before, but I don’t see the solution.
I just installed Asterisk with FreePBX for the first time. Everything works, but I keep getting the following error message from the console.
<--- Received SIP request (331 bytes) from UDP:192.168.192.95:5160 ---> NOTIFY sip:192.168.192.86:5060 SIP/2.0 v: SIP/2.0/UDP 192.168.192.95:5160;branch=z9hG4bK-9d4c1150 f: xxxxx<sip:email@example.com:5060>;tag=dcb4ce23d31c835bo0 t: <sip:192.168.192.86:5060> i: firstname.lastname@example.org CSeq: 222 NOTIFY Max-Forwards: 70 o: keep-alive User-Agent: Linksys/PAP2T-5.1.6(LS) l: 0 <--- Transmitting SIP response (354 bytes) to UDP:192.168.192.95:5160 ---> SIP/2.0 400 Missing Contact header Via: SIP/2.0/UDP 192.168.192.95:5160;received=192.168.192.95;branch=z9hG4bK-9d4c1150 Call-ID: email@example.com From: "XXXXXX" <sip:firstname.lastname@example.org>;tag=dcb4ce23d31c835bo0 To: <sip:192.168.192.86>;tag=z9hG4bK-9d4c1150 CSeq: 222 NOTIFY Server: FPBX-18.104.22.168(13.99.99) Content-Length: 0
…95 is a Cisco PAP2T. All other devices in the system behave correctly. I cannot find the ‘Missing Contact Header’ it refers to; and am unsure of the value that should be applied to it when I find it, which is causing the 400 error.
Can someone point me to the right direction, so I can resolve this repeating error message?