RTP proxy is enabled, happened for PSTN termination. also happpened when 2 SIP client behind the different NAT, or when the 2 SIP client behind same NAT, the BYE message will cause the same error message.
The configuration file is just the same as the file from startup package for RTP Proxy.
U 69.88.77.66:5120 -> 201.22.33.178:5060 SIP/2.0 200 OK..Via: SIP/2.0/UDP 201.22.33.178:5060;branch=0..Call-ID: c87 e3594-32a56723-65e5 [!at] 201.22.33.178..CSeq (replace the [!at] with a @): 1 OPTIONS..From: sip:pinger@opens er.org;tag=ad27d066..To: sip:69.88.77.66:5120;tag=qjp2KfWkSXDEoML2..Cont act: sip:1001@192.168.1.10:5120..Allow: INVITE, ACK, OPTIONS, BY E, CANCEL, REFER, NOTIFY, INFO, PRACK, UPDATE, MESSAGE..Accept: application /sdp, message/sipfrag, application/dtmf-relay..Supported: replaces..Content -Length: 0..
U 69.88.77.66:5120 -> 201.22.33.178:5060 INVITE sip:12127977000@201.22.33.178 SIP/2.0..Via: SIP/2.0/UDP 192.1 68.1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc..Max-Forwards: 70..User-Agent: COSUN V1.49.002 CFG0 ..From: "1001" sip:1001@201.22.33. 178;tag=CXTKU08d8synkO1U..To: "12127977000" sip:12127977000@2 03.98.176.178..Call-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..Contact (replace the [!at] with a @): <sip:08688 99500500 [!at] 192.168.1.10 (replace the [!at] with a @):5120>..CSeq: 1 INVITE..Supported: replaces..Content-T ype: application/sdp..Content-Length: 315....v=0..o=- 91081239 73141710 IN IP4 192.168.1.10..s=SIP CALL..c=IN IP4 192.168.1.10..t=0 0..m=audio 5121 RT P/AVP 18 4 0 97 3 8 101..a=rtpmap:18 G729/8000..a=rtpmap:4 G723/8000..a=rtp map:0 PCMU/8000..a=rtpmap:97 iLBC/8000..a=rtpmap:3 GSM/8000..a=rtpmap:8 PCM A/8000..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15..
U 201.22.33.178:5060 -> 69.88.77.66:5120 SIP/2.0 100 trying -- your call is important to us..Via: SIP/2.0/UDP 192.16 8.1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc;rport=5120;received=203.122.70.1 55..From: "1001" sip:1001@201.22.33.178;tag=CXTKU08d8s ynkO1U..To: "12127977000" sip:12127977000@201.22.33.178..Cal l-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..CSeq (replace the [!at] with a @): 1 INVITE..Server: OpenSer (1.0.1 (i386/linux))..Content-Length: 0..Warning: 392 201.22.33.178:5060 "Noisy feedback tells: pid=16917 req_src_ip=69.88.77.66 req_src_port=5120 in_u ri=sip:12127977000@201.22.33.178 out_uri=sip:12127977000@203.9 8.176.174 via_cnt==1"....
U 201.22.33.178:5060 -> 69.88.77.66:5120 SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)..Via: SIP/2.0/ UDP 192.168.1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc;rport=5120;received=20 3.122.70.155..From: "1001" sip:1001@201.22.33.178;tag= CXTKU08d8synkO1U..To: "12127977000" sip:12127977000@201.22.33 .178;tag=329cfeaa6ded039da25ff8cbb8668bd2.473f..Call-ID: ziblKnSznNbjxCjv@ 192.168.1.10..CSeq: 1 INVITE..Server: OpenSer (1.0.1 (i386/linux))..Content -Length: 0..Warning: 392 201.22.33.178:5060 "Noisy feedback tells: pid=16 917 req_src_ip=69.88.77.66 req_src_port=5120 in_uri=sip:0069086298266808 2 [!at] 201.22.33.178 (replace the [!at] with a @) out_uri=sip:12127977000@201.22.33.174 via_cnt==1".. ..
U 201.22.33.178:5060 -> 201.22.33.174:5060 INVITE sip:12127977000@201.22.33.174 SIP/2.0..Record-Route: sip:203 .98.176.178;ftag=CXTKU08d8synkO1U;lr=on..Via: SIP/2.0/UDP 201.22.33.178;b ranch=z9hG4bK96da.4cdeb4.0..Via: SIP/2.0/UDP 192.168.1.10:5120;rport=5120;r eceived=69.88.77.66;branch=z9hG4bK2xcF52ZeIG9RyjPc..Max-Forwards: 69..Us er-Agent: COSUN V1.49.002 CFG0 ..From: "1001" sip:1001@2 03.98.176.178;tag=CXTKU08d8synkO1U..To: "12127977000" <sip:006908629 82668082 [!at] 201.22.33.178 (replace the [!at] with a @)>..Call-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..Contact (replace the [!at] with a @): sip:1001@69.88.77.66:5120..CSeq: 1 INVITE..Supported: replace s..Content-Type: application/sdp..Content-Length: 336....v=0..o=- 91081239 73141710 IN IP4 192.168.1.10..s=SIP CALL..c=IN IP4 201.22.33.178..t=0 0..m =audio 35042 RTP/AVP 18 4 0 97 3 8 101..a=rtpmap:18 G729/8000..a=rtpmap:4 G 723/8000..a=rtpmap:0 PCMU/8000..a=rtpmap:97 iLBC/8000..a=rtpmap:3 GSM/8000. .a=rtpmap:8 PCMA/8000..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15.. a=nortpproxy:yes..
U 201.22.33.174:5060 -> 201.22.33.178:5060 SIP/2.0 100 Trying..Via: SIP/2.0/UDP 201.22.33.178;branch=z9hG4bK96da.4cde b4.0,SIP/2.0/UDP 192.168.1.10:5120;rport=5120;received=69.88.77.66;branc h=z9hG4bK2xcF52ZeIG9RyjPc..From: "1001" sip:1001@203.98. 176.178;tag=CXTKU08d8synkO1U..To: "12127977000" <sip:006908629826680 82 [!at] 201.22.33.178 (replace the [!at] with a @)>;tag=BD997FE4-12B5..Date: Wed, 05 Jul 2006 09:54:41 GMT.. Call-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..Server (replace the [!at] with a @): Cisco-SIPGateway/IOS-12.x.. CSeq: 1 INVITE..Content-Length: 0....
U 201.22.33.178:5060 -> 69.88.77.66:5120 SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)..Via: SIP/2.0/ UDP 192.168.1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc;rport=5120;received=20 3.122.70.155..From: "1001" sip:1001@201.22.33.178;tag= CXTKU08d8synkO1U..To: "12127977000" sip:12127977000@201.22.33 .178;tag=329cfeaa6ded039da25ff8cbb8668bd2.473f..Call-ID: ziblKnSznNbjxCjv@ 192.168.1.10..CSeq: 1 INVITE..Server: OpenSer (1.0.1 (i386/linux))..Content -Length: 0..Warning: 392 201.22.33.178:5060 "Noisy feedback tells: pid=16 917 req_src_ip=69.88.77.66 req_src_port=5120 in_uri=sip:0069086298266808 2 [!at] 201.22.33.178 (replace the [!at] with a @) out_uri=sip:12127977000@201.22.33.174 via_cnt==1".. ..
U 69.88.77.66:5120 -> 201.22.33.178:5060 ACK sip:12127977000@201.22.33.178 SIP/2.0..Via: SIP/2.0/UDP 192.168. 1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc..Max-Forwards: 70..User-Agent: COS UN V1.49.002 CFG0 ..From: "1001" <sip:1001@201.22.33.178
;tag=CXTKU08d8synkO1U..To: "12127977000" <sip:12127977000@203.
98.176.178>;tag=329cfeaa6ded039da25ff8cbb8668bd2.473f..Call-ID: ziblKnSznNb jxCjv [!at] 192.168.1.10..Contact (replace the [!at] with a @): sip:1001@192.168.1.10:5120..CSeq: 1 ACK..Content-Length: 0....
U 69.88.77.66:5120 -> 201.22.33.178:5060 ACK sip:12127977000@201.22.33.178 SIP/2.0..Via: SIP/2.0/UDP 192.168. 1.10:5120;branch=z9hG4bK2xcF52ZeIG9RyjPc..Max-Forwards: 70..User-Agent: COS UN V1.49.002 CFG0 ..From: "1001" <sip:1001@201.22.33.178
;tag=CXTKU08d8synkO1U..To: "12127977000" <sip:12127977000@203.
98.176.178>;tag=329cfeaa6ded039da25ff8cbb8668bd2.473f..Call-ID: ziblKnSznNb jxCjv [!at] 192.168.1.10..Contact (replace the [!at] with a @): sip:1001@192.168.1.10:5120..CSeq: 1 ACK..Content-Length: 0....
U 201.22.33.174:5060 -> 201.22.33.178:5060 SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP 201.22.33.178;branch=z9hG4b K96da.4cdeb4.0,SIP/2.0/UDP 192.168.1.10:5120;rport=5120;received=203.122.70 .155;branch=z9hG4bK2xcF52ZeIG9RyjPc..From: "1001" <sip:08688995005 00 [!at] 201.22.33.178 (replace the [!at] with a @)>;tag=CXTKU08d8synkO1U..To: "12127977000" <sip:00690 862982668082 [!at] 201.22.33.178 (replace the [!at] with a @)>;tag=BD997FE4-12B5..Date: Wed, 05 Jul 2006 09:5 4:41 GMT..Call-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..Server (replace the [!at] with a @): Cisco-SIPGateway/ IOS-12.x..CSeq: 1 INVITE..Content-Type: application/sdp..Content-Dispositio n: session;handling=required..Content-Length: 214....v=0..o=CiscoSystemsSIP -GW-UserAgent 5365 5815 IN IP4 201.22.33.174..s=SIP Call..c=IN IP4 203.98. 176.174..t=0 0..m=audio 16512 RTP/AVP 18 101..a=rtpmap:18 G729/8000..a=rtpm ap:101 telephone-event/8000..a=fmtp:101 ..
U 201.22.33.178:5060 -> 69.88.77.66:5120 SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP 192.168.1.10:5120;rport=5120 ;received=69.88.77.66;branch=z9hG4bK2xcF52ZeIG9RyjPc..From: "08688995005 00" sip:1001@201.22.33.178;tag=CXTKU08d8synkO1U..To: "006908629 82668082" sip:12127977000@201.22.33.178;tag=BD997FE4-12B5..Date: W ed, 05 Jul 2006 09:54:41 GMT..Call-ID: ziblKnSznNbjxCjv [!at] 192.168.1.10..Serve (replace the [!at] with a @) r: Cisco-SIPGateway/IOS-12.x..CSeq: 1 INVITE..Content-Type: application/sdp ..Content-Disposition: session;handling=required..Content-Length: 232....v= 0..o=CiscoSystemsSIP-GW-UserAgent 5365 5815 IN IP4 201.22.33.174..s=SIP Ca ll..c=IN IP4 201.22.33.178..t=0 0..m=audio 35044 RTP/AVP 18 101..a=rtpmap: 18 G729/8000..a=rtpmap:101 telephone-event/8000..a=fmtp:101 ..a=nortpproxy: yes..