Hi, I’ve installed Asterisk for use as a SIP server. I can call people, but one strange thing happens: if I call someone with a SIP account outside my server (for example, sip:enum-echo-t...@sip.nemox.net) everything is fine, if I call any Asterisk extension it also works, but the call gets disconnected in about 20 seconds. To be exact, audio is turned off but the SIP client still thinks it’s connected.
Logs say “no reply to our critical packet”. tcpdump shows that the packet does arrive at the destination. sip set debug shows this is what the packet contains: Retransmitting #6 (NAT) to 77.239.189.223:5060: SIP/2.0 200 OK Via: SIP/2.0/UDP 77.239.189.223;branch=z9hG4bK-d8754z-db899ced94cc7fd3-1---d8754z-;received=77.239.189.223 From: "Roma"<sip:r...@qwertty.com;transport=UDP>;tag=01785d5e To: <sip:e...@qwertty.com;transport=UDP>;tag=as068592d2 Call-ID: ZTkzNjYxNzZmOWMzY2ZhOTdjMWIwYTEwZTYxZmUyZTY. CSeq: 2 INVITE User-Agent: Asterisk PBX Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Contact: <sip:e...@78.46.49.80> Content-Type: application/sdp Content-Length: 285 v=0 o=root 25952 25952 IN IP4 78.46.49.80 s=session c=IN IP4 78.46.49.80 t=0 0 m=audio 30606 RTP/AVP 3 0 8 101 a=rtpmap:3 GSM/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:20 a=sendrecv There’s NAT: computer (192.168.1.2) behind a router (77.239.189.223), the server (78.46.49.80) doesn’t have any NAT. I have even set DMZ host to 192.168.1.2, so I’m sure all packets reach it. As far as I understand, Asterisk expects the SIP client to reply to that packet with an ACK, the client receives the packet but does not reply. What have I configured incorrectly? In sip.conf I have nat=yes (otherwise I don’t hear anything), whatever I do with NAT settings of SIP clients does not help. Maybe there’s something wrong with the headers of the packet that makes the client think the packet is misaddressed? Twinkle says, “you have the following registrations <sip:r...@192.168.1.2>” while I’d expect <sip:r...@qwertty.com>. So how do I make sure the client sends its ACK? -- TIA Roman.
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