U 2012/07/24 15:52:20.968054 1.1.1.1:5060 -> 2.2.2.2:5060 INVITE sip:735603@2.2.2.2 SIP/2.0. Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: . Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Supported: replaces, timer, 100rel, early-session. Min-SE: 1800. Date: Sun, 11 Jan 2010 22:42:47 GMT. Session-Expires: 1800. User-Agent: AddPac SIP Gateway. Contact: . Accept: application/sdp. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, PRACK, REFER, NOTIFY, INFO. Content-Type: application/sdp. Content-Length: 270. Max-Forwards: 70. . v=0. o=4862442964 945767 945767 IN IP4 1.1.1.1. s=AddPac Gateway SDP. c=IN IP4 1.1.1.1. t=0 0. m=audio 23002 RTP/AVP 18 8 0 101. a=ptime:80. a=rtpmap:18 G729/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:0 PCMU/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. U 2012/07/24 15:52:20.968307 2.2.2.2:5060 -> 1.1.1.1:5060 SIP/2.0 100 Giving a try. Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: . Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Content-Length: 0. . U 2012/07/24 15:52:20.970247 2.2.2.2:5060 -> 3.3.3.3:5060 INVITE sip:735603@3.3.3.3:5060 SIP/2.0. Record-Route: . Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK8f52.5ec4773.0. Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: . Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Supported: replaces, timer, 100rel, early-session. Min-SE: 1800. Date: Sun, 11 Jan 2010 22:42:47 GMT. Session-Expires: 1800. User-Agent: AddPac SIP Gateway. Contact: . P-Asserted-Identity: . Remote-Party-ID:;party=calling;screen=yes;privacy=off. Accept: application/sdp. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, PRACK, REFER, NOTIFY, INFO. Content-Type: application/sdp. Content-Length: 294. Max-Forwards: 70. . v=0. o=4862442964 945767 945767 IN IP4 2.2.2.2. s=AddPac Gateway SDP. c=IN IP4 2.2.2.2. t=0 0. m=audio 40834 RTP/AVP 18 8 0 101. a=ptime:80. a=rtpmap:18 G729/8000. a=rtpmap:8 PCMA/8000. a=rtpmap:0 PCMU/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=nortpproxy:yes. U 2012/07/24 15:52:20.994730 3.3.3.3:5060 -> 2.2.2.2:5060 SIP/2.0 100 Trying. Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK8f52.5ec4773.0,SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: . Date: Tue, 24 Jul 2012 11:56:20 GMT. Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Allow-Events: telephone-event. Server: Cisco-SIPGateway/IOS-12.x. Content-Length: 0. . U 2012/07/24 15:52:21.981394 3.3.3.3:5060 -> 2.2.2.2:5060 SIP/2.0 486 Busy here. Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK8f52.5ec4773.0,SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: ;tag=E9560618-197A. Date: Tue, 24 Jul 2012 11:56:20 GMT. Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Allow-Events: telephone-event. Server: Cisco-SIPGateway/IOS-12.x. Reason: Q.850;cause=17. Content-Length: 0. . U 2012/07/24 15:52:21.981549 2.2.2.2:5060 -> 3.3.3.3:5060 ACK sip:735603@3.3.3.3:5060 SIP/2.0. Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bK8f52.5ec4773.0. From: ;tag=67000fc7a4. Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. To: ;tag=E9560618-197A. CSeq: 216 ACK. Max-Forwards: 70. Content-Length: 0. . U 2012/07/24 15:52:22.011214 2.2.2.2:5060 -> 1.1.1.1:5060 SIP/2.0 486 Busy here. Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: ;tag=E9560618-197A. Date: Tue, 24 Jul 2012 11:56:20 GMT. Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 INVITE. Allow-Events: telephone-event. Server: Cisco-SIPGateway/IOS-12.x. Reason: Q.850;cause=17. Content-Length: 0. . U 2012/07/24 15:52:22.048639 1.1.1.1:5060 -> 2.2.2.2:5060 ACK sip:735603@2.2.2.2 SIP/2.0. Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK67000fc7a4216. From: ;tag=67000fc7a4. To: ;tag=E9560618-197A. Call-ID: 676e0e00-ac77-0f22-80c7-0002a4085a16@1.1.1.1. CSeq: 216 ACK. Content-Length: 0. Max-Forwards: 70.