No. Time Source Destination Protocol Info 19 4.705489 172.16.254.2 172.16.10.42 SIP/SDP Request: INVITE sip:+38514697626@172.16.10.42:5060;user=phone, with session description Frame 19 (899 bytes on wire, 899 bytes captured) Ethernet II, Src: Portwell_0f:89:76 (00:90:fb:0f:89:76), Dst: AsustekC_00:38:22 (00:e0:18:00:38:22) Internet Protocol, Src: 172.16.254.2 (172.16.254.2), Dst: 172.16.10.42 (172.16.10.42) Transmission Control Protocol, Src Port: 1030 (1030), Dst Port: 5060 (5060), Seq: 1, Ack: 1, Len: 845 Source port: 1030 (1030) Destination port: 5060 (5060) Sequence number: 1 (relative sequence number) [Next sequence number: 846 (relative sequence number)] Acknowledgement number: 1 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size: 32768 Checksum: 0x63b5 [incorrect, should be 0xd75e (maybe caused by "TCP checksum offload"?)] [Good Checksum: False] [Bad Checksum: True] Session Initiation Protocol Request-Line: INVITE sip:+38514697626@172.16.10.42:5060;user=phone SIP/2.0 Message Header Via: SIP/2.0/TCP 172.16.254.2:5060;branch=z9hG4bK2653465472-1443356 Max-Forwards: 70 Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY Accept: application/sdp,application/simple-message-summary Supported: timer,replaces From: "4697626" ;tag=sipcontrol_2653465472-1508892 To: Call-ID: 9e28ab80-15061c-3@172.16.254.2 CSeq: 1 INVITE Contact: Dialogic Diva SIPcontrol Content-Type: application/sdp Content-Length: 243 Message body Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): sipcontrol 256 2 IN IP4 172.16.254.2 Session Name (s): - Connection Information (c): IN IP4 172.16.254.2 Time Description, active time (t): 0 0 Media Description, name and address (m): audio 30012 RTP/AVP 8 0 101 13 Media Attribute (a): rtpmap:8 PCMA/8000 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute (a): rtpmap:101 telephone-event/8000 Media Attribute (a): fmtp:101 0-15 Media Attribute (a): rtpmap:13 CN/8000 Media Attribute (a): sendrecv No. Time Source Destination Protocol Info 20 4.708854 172.16.10.42 172.16.254.2 SIP Status: 100 Trying Frame 20 (357 bytes on wire, 357 bytes captured) Ethernet II, Src: AsustekC_00:38:22 (00:e0:18:00:38:22), Dst: Portwell_0f:89:76 (00:90:fb:0f:89:76) Internet Protocol, Src: 172.16.10.42 (172.16.10.42), Dst: 172.16.254.2 (172.16.254.2) Transmission Control Protocol, Src Port: 5060 (5060), Dst Port: 1030 (1030), Seq: 1, Ack: 846, Len: 303 Source port: 5060 (5060) Destination port: 1030 (1030) Sequence number: 1 (relative sequence number) [Next sequence number: 304 (relative sequence number)] Acknowledgement number: 846 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size: 64690 Checksum: 0xb3ff [correct] [Good Checksum: True] [Bad Checksum: False] [SEQ/ACK analysis] Session Initiation Protocol Status-Line: SIP/2.0 100 Trying Message Header FROM: "4697626";tag=sipcontrol_2653465472-1508892 TO: CSEQ: 1 INVITE CALL-ID: 9e28ab80-15061c-3@172.16.254.2 VIA: SIP/2.0/TCP 172.16.254.2:5060;branch=z9hG4bK2653465472-1443356 Content-Length: 0 No. Time Source Destination Protocol Info 23 5.928154 172.16.10.42 172.16.254.2 SIP Status: 500 Internal Server Error Frame 23 (425 bytes on wire, 425 bytes captured) Ethernet II, Src: AsustekC_00:38:22 (00:e0:18:00:38:22), Dst: Portwell_0f:89:76 (00:90:fb:0f:89:76) Internet Protocol, Src: 172.16.10.42 (172.16.10.42), Dst: 172.16.254.2 (172.16.254.2) Transmission Control Protocol, Src Port: 5060 (5060), Dst Port: 1030 (1030), Seq: 304, Ack: 846, Len: 371 Source port: 5060 (5060) Destination port: 1030 (1030) Sequence number: 304 (relative sequence number) [Next sequence number: 675 (relative sequence number)] Acknowledgement number: 846 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size: 64690 Checksum: 0xe936 [correct] [Good Checksum: True] [Bad Checksum: False] [SEQ/ACK analysis] Session Initiation Protocol Status-Line: SIP/2.0 500 Internal Server Error Message Header FROM: "4697626";tag=sipcontrol_2653465472-1508892 TO: ;tag=9f37c7987e CSEQ: 1 INVITE CALL-ID: 9e28ab80-15061c-3@172.16.254.2 VIA: SIP/2.0/TCP 172.16.254.2:5060;branch=z9hG4bK2653465472-1443356 Content-Length: 0 SERVER: RTCC/3.0.0.0 MediationServer No. Time Source Destination Protocol Info 24 5.929233 172.16.254.2 172.16.10.42 SIP Request: ACK sip:+38514697626@172.16.10.42:5060;user=phone Frame 24 (494 bytes on wire, 494 bytes captured) Ethernet II, Src: Portwell_0f:89:76 (00:90:fb:0f:89:76), Dst: AsustekC_00:38:22 (00:e0:18:00:38:22) Internet Protocol, Src: 172.16.254.2 (172.16.254.2), Dst: 172.16.10.42 (172.16.10.42) Transmission Control Protocol, Src Port: 1030 (1030), Dst Port: 5060 (5060), Seq: 846, Ack: 675, Len: 440 Source port: 1030 (1030) Destination port: 5060 (5060) Sequence number: 846 (relative sequence number) [Next sequence number: 1286 (relative sequence number)] Acknowledgement number: 675 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size: 32094 Checksum: 0x6220 [incorrect, should be 0xe5b1 (maybe caused by "TCP checksum offload"?)] [Good Checksum: False] [Bad Checksum: True] [SEQ/ACK analysis] Session Initiation Protocol Request-Line: ACK sip:+38514697626@172.16.10.42:5060;user=phone SIP/2.0 Message Header Via: SIP/2.0/TCP 172.16.254.2:5060;branch=z9hG4bK2653465472-1443356 Max-Forwards: 70 From: "4697626" ;tag=sipcontrol_2653465472-1508892 To: ;tag=9f37c7987e Call-ID: 9e28ab80-15061c-3@172.16.254.2 CSeq: 1 ACK Contact: Dialogic Diva SIPcontrol Content-Length: 0