Hi, Our Cisco 7940 phones on a single network sometimes seem to drop calls as soon as they are picked up. After a second INVITE the phone sends '500 Internal Error'. One phone thinks its still in a call (though there is no audio) while the other phone is not in a call.
The drop happens immediately after connecting and I think it is due to a second INVITE. Turning reinvite off seems like it fixes the problem but I haven't tested enough to be sure yet. The bug only seems to happen on the first time a call is made after a period of time (and even then only occasionally). Successive calls between the same phones are always fine. That makes debugging it a bit of a pain. I have managed to capture a packet trace between * (10.200.4.100) and the 7940 (10.200.4.66) showing the error. 36.437814 10.200.4.100 -> 10.200.4.66 SIP/SDP Request: INVITE sip:[email protected]:5060;transport=udp, with session description 36.584594 10.200.4.66 -> 10.200.4.100 SIP Status: 100 Trying 36.720893 10.200.4.66 -> 10.200.4.100 SIP Status: 180 Ringing 43.211744 10.200.4.66 -> 10.200.4.100 SIP/SDP Status: 200 OK, with session description 43.212001 10.200.4.100 -> 10.200.4.66 SIP Request: ACK sip:[email protected]:5060;transport=udp 43.212536 10.200.4.100 -> 10.200.4.66 SIP/SDP Request: INVITE sip:[email protected]:5060;transport=udp, with session description 43.304295 10.200.4.66 -> 10.200.4.100 SIP Status: 500 Internal Server Error 43.304489 10.200.4.100 -> 10.200.4.66 SIP Request: ACK sip:[email protected]:5060;transport=udp 43.402253 Cisco_76:a5:0f -> Broadcast ARP Who has 10.200.4.100? Tell 10.200.4.66 43.470520 10.200.4.66 -> 10.200.4.100 RTP PT=ITU-T G.711 PCMA, SSRC=0xFA576B7, Seq=2616, Time=414864, Mark There is a description of an error http://lists.iptel.org/pipermail/serdev/2005-November/006344.html which seems similar but since its in 2005 I assume the problem would be fixed by now. If that is the problem, can anybody suggest a workaround? I have upgraded the phones to the most recent firmware (POS3-08-11-00) and * is "Version: 1:1.4.21.2~dfsg-3+lenny1" (debian). Can anybody offer any advice or suggestions on fixing or debugging this further? If anybody else has encountered the problem and knows of a fix that would be great. Thanks, Ian Crowther -- ======================================================================= Ian Crowther Tel: +44 845 4501626 Unit 108, 10th Avenue, IT Dept, Comtek Fax: +44 845 4501627 Zone 3, Deeside Industrial Network Systems UK Ltd Park, CH5 2UA, Flintshire ======================================================================= -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
