Re: [Serusers] [OT?]BYE issues

1. I don't see any ACK packets in the packet dump. Does it work if you use UDP instead of TCP?

regards, Klaus

Andrew Mee wrote:

However, if the end point that received the INVITE (RTC Client B) subsequently sends the BYE, then the BYE is INCORRECTLY

FORWARDED to RTC client B which (correctly) responds with a 481 like this...

RTC Client A SIP Server RTC Client B -----INVITE--------------> -----INVITE----------------> <----100 Trying----------- <----100 Trying------------- <----180 Ringing---------- <----180 Ringing------------ <----200 OK--------------- <----200 OK----------------- -----ACK-----------------> -----ACK-------------------> ... <----BYE-------------------- -----BYE-------------------> <----481 Call Leg/T DNE----

At first I thought maybe the SIP server was sending the BYE to the wrong place in error. So I checked on some public servers like sipphone.com and the behaviour was the same. Also, to check that this was not my RTC client application code

messing up, I reproduced the same problem with RTCSample which is shipped with RTC 1.2.

Has anyone else seend this behaviour? Is this a known problem? ANy suggested workarounds?

Thanks in advance ...

For anyone interested, here is the ethereal log of the problematic scenario. In this case RTC Client A is

17476684616@sipphone.com, RTC Client B is 17476685542@sipphone.com and the SIP Server is 198.65.166.131.

No. Time Source Destination Protocol Info 26 12.514112 198.65.166.144 192.168.2.16 SIP/SDP [TCP Retransmission] Request: INVITE

sip:xxx.xxx.xxx.135:55007;transport=tcp, with session description

Frame 26 (1506 bytes on wire, 1506 bytes captured) Arrival Time: Aug 16, 2004 13:14:42.171480000 Time delta from previous packet: 12.514112000 seconds Time since reference or first frame: 12.514112000 seconds Frame Number: 26 Packet Length: 1506 bytes Capture Length: 1506 bytes Ethernet II, Src: 00:09:5b:a8:af:c8, Dst: 00:08:a1:05:a7:17 Destination: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Source: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Type: IP (0x0800) Internet Protocol, Src Addr: 198.65.166.144 (198.65.166.144), Dst Addr: 192.168.2.16 (192.168.2.16) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x10 (DSCP 0x04: Unknown DSCP; ECN: 0x00) 0001 00.. = Differentiated Services Codepoint: Unknown (0x04) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 1492 Identification: 0xf9f6 (63990) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 46 Protocol: TCP (0x06) Header checksum: 0x1d93 (correct) Source: 198.65.166.144 (198.65.166.144) Destination: 192.168.2.16 (192.168.2.16) Transmission Control Protocol, Src Port: 35683 (35683), Dst Port: 7534 (7534), Seq: 1, Ack: 1, Len: 1440 Source port: 35683 (35683) Destination port: 7534 (7534) Sequence number: 1 (relative sequence number) Next sequence number: 1441 (relative sequence number) Acknowledgement number: 1 (relative ack number) Header length: 32 bytes Flags: 0x0010 (ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 0... = Push: Not set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 5808 Checksum: 0x4692 (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 961303496, tsecr 0 SEQ/ACK analysis TCP Analysis Flags This frame is a (suspected) retransmission Session Initiation Protocol Request-Line: INVITE sip:xxx.xxx.xxx.135:55007;transport=tcp SIP/2.0 Method: INVITE Resent Packet: False Message Header Record-Route: sip:17476685542@198.65.166.131;transport=tcp;ftag=8fff010e644f4415a81b01004f5525f3;lr

  Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.41ffc1f4.1;i=911
  Via: SIP/2.0/TCP xxx.xxx.xxx.135:44538
  Max-Forwards: 69
  From: "HS User" 

sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP from address: "HS User" 

sip:17476684616@proxy01.sipphone.com SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a To: sip:17476685542@sipphone.com Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28 CSeq: 1 INVITE Contact: sip:17476684616@proxy01.sipphone.com:44538;maddr=xxx.xxx.xxx.135;transport=tcp;nat=yes

  User-Agent: RTC/1.2
  Content-Type: application/sdp
  Content-Length: 765
  P-hint: usrloc routed
  P-RTP-Proxy: YES
  P-Behind-NAT: Yes

Message body Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): - 0 0 IN IP4 xxx.xxx.xxx.135 Owner Username: - Session ID: 0 Session Version: 0 Owner Network Type: IN Owner Address Type: IP4 Owner Address: xxx.xxx.xxx.135 Session Name (s): session Connection Information (c): IN IP4 198.65.166.131 Connection Network Type: IN Connection Address Type: IP4 Connection Address: 198.65.166.131 Bandwidth Information (b): CT:1000 Bandwidth Modifier: CT Bandwidth Value: 1000 Time Description, active time (t): 0 0 Session Start Time: 0 Session Stop Time: 0 Media Description, name and address (m): audio 47206 RTP/AVP 97 111 112 6 0 8 4 5 3 101 Media Type: audio Media Port: 47206 Media Proto: RTP/AVP Media Format: 97 Media Format: 111 Media Format: 112 Media Format: 6 Media Format: 0 Media Format: 8 Media Format: 4 Media Format: 5 Media Format: 3 Media Format: 101 Encryption Key (k): base64:UPAp6wJTz2cKuhRz2kaheKDj8gepCwNLQfyrmuH4s+E Key Type: base64 Key Data: UPAp6wJTz2cKuhRz2kaheKDj8gepCwNLQfyrmuH4s+E Media Attribute (a): rtpmap:97 red/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 97 red/8000 Media Attribute (a): rtpmap:111 SIREN/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 111 SIREN/16000 Media Attribute (a): fmtp:111 bitrate=16000 Media Attribute Fieldname: fmtp Media Attribute Value: 111 bitrate=16000 Media Attribute (a): rtpmap:112 G7221/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 112 G7221/16000 Media Attribute (a): fmtp:112 bitrate=24000 Media Attribute Fieldname: fmtp Media Attribute Value: 112 bitrate=24000 Media Attribute (a): rtpmap:6 DVI4/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 6 DVI4/16000 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 0 PCMU/8000 Media Attribute (a): rtpmap:8 PCMA/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 8 PCMA/8000 Media Attribute (a): rtpmap:4 G723/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 4 G723/8000 Media Attribute (a): rtpmap:5 DVI4/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 5 DVI4/8000 Media Attribute (a): rtpmap:3 GSM/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 3 GSM/8000 Media Attribute (a): rtpmap:101 telephone-event/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 101 telephone-event/8000 Media Attribute (a): fmtp:101 0-16 Media Attribute Fieldname: fmtp Media Attribute Value: 101 0-16 Media Attribute (a): encryption:optional Media Attribute Fieldname: encryption Media Attribute Value: optional Media Description, name and address (m): video 57526 RTP/AVP 34 31 Media Type: video Media Port: 57526 Media Proto: RTP/AVP Media Format: 34 Media Format: 31 Encryption Key (k): base64:dXc/jG6ZtplhGUCGBKCdIfntQR/PxRNDeymbnC9WK9U Key Type: base64 Key Data: dXc/jG6ZtplhGUCGBKCdIfntQR/PxRNDeymbnC9WK9U Media Attribute (a): rtpmap:34 H263/90000 Media Attribute Fieldname: rtpmap Media Attribute Value: 34 H263/90000 Media Attribute (a): rtpmap:31 H261/90000 Media Attribute Fieldname: rtpmap Media Attribute Value: 31 H261/90000 Media Attribute (a): encryption:optional Media Attribute Fieldname: encryption Media Attribute Value: optional Media Description, name and address (m): application 27591 tcp msdat Media Type: application Media Port: 27591 Media Proto: tcp Media Format: msdat

No. Time Source Destination Protocol Info 28 12.514795 192.168.2.16 198.65.166.144 SIP Status: 100 Trying

Frame 28 (489 bytes on wire, 489 bytes captured) Arrival Time: Aug 16, 2004 13:14:42.172163000 Time delta from previous packet: 0.000683000 seconds Time since reference or first frame: 12.514795000 seconds Frame Number: 28 Packet Length: 489 bytes Capture Length: 489 bytes Ethernet II, Src: 00:08:a1:05:a7:17, Dst: 00:09:5b:a8:af:c8 Destination: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Source: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.2.16 (192.168.2.16), Dst Addr: 198.65.166.144 (198.65.166.144) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 475 Identification: 0x16ee (5870) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0xb2a4 (correct) Source: 192.168.2.16 (192.168.2.16) Destination: 198.65.166.144 (198.65.166.144) Transmission Control Protocol, Src Port: 7534 (7534), Dst Port: 35683 (35683), Seq: 1, Ack: 1497, Len: 423 Source port: 7534 (7534) Destination port: 35683 (35683) Sequence number: 1 (relative sequence number) Next sequence number: 424 (relative sequence number) Acknowledgement number: 1497 (relative ack number) Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 65535 Checksum: 0x093b (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 31110, tsecr 961303496 Session Initiation Protocol Status-Line: SIP/2.0 100 Trying Status-Code: 100 Resent Packet: False Message Header Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.41ffc1f4.1;i=911 Via: SIP/2.0/TCP xxx.xxx.xxx.135:44538 From: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP from address: "HS User" 

sip:17476684616@proxy01.sipphone.com SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a To: sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP to address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28 CSeq: 1 INVITE User-Agent: RTC/1.2 Content-Length: 0

No. Time Source Destination Protocol Info 30 12.756633 192.168.2.16 198.65.166.144 SIP Status: 180 Ringing

Frame 30 (593 bytes on wire, 593 bytes captured) Arrival Time: Aug 16, 2004 13:14:42.414001000 Time delta from previous packet: 0.241838000 seconds Time since reference or first frame: 12.756633000 seconds Frame Number: 30 Packet Length: 593 bytes Capture Length: 593 bytes Ethernet II, Src: 00:08:a1:05:a7:17, Dst: 00:09:5b:a8:af:c8 Destination: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Source: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.2.16 (192.168.2.16), Dst Addr: 198.65.166.144 (198.65.166.144) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 579 Identification: 0x16ef (5871) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0xb23b (correct) Source: 192.168.2.16 (192.168.2.16) Destination: 198.65.166.144 (198.65.166.144) Transmission Control Protocol, Src Port: 7534 (7534), Dst Port: 35683 (35683), Seq: 424, Ack: 1497, Len: 527 Source port: 7534 (7534) Destination port: 35683 (35683) Sequence number: 424 (relative sequence number) Next sequence number: 951 (relative sequence number) Acknowledgement number: 1497 (relative ack number) Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 65535 Checksum: 0x0931 (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 31113, tsecr 961303529 Session Initiation Protocol Status-Line: SIP/2.0 180 Ringing Status-Code: 180 Resent Packet: False Message Header Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.41ffc1f4.1;i=911 Via: SIP/2.0/TCP xxx.xxx.xxx.135:44538 From: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP from address: "HS User" 

sip:17476684616@proxy01.sipphone.com SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a To: sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP to address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28 CSeq: 1 INVITE Record-Route: sip:17476685542@198.65.166.131;transport=tcp;ftag=8fff010e644f4415a81b01004f5525f3;lr

  User-Agent: RTC/1.2
  Content-Length: 0

No. Time Source Destination Protocol Info 123 14.874474 192.168.2.16 198.65.166.144 SIP/SDP Status: 200 OK, with session description

Frame 123 (1446 bytes on wire, 1446 bytes captured) Arrival Time: Aug 16, 2004 13:14:44.531842000 Time delta from previous packet: 2.117841000 seconds Time since reference or first frame: 14.874474000 seconds Frame Number: 123 Packet Length: 1446 bytes Capture Length: 1446 bytes Ethernet II, Src: 00:08:a1:05:a7:17, Dst: 00:09:5b:a8:af:c8 Destination: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Source: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.2.16 (192.168.2.16), Dst Addr: 198.65.166.144 (198.65.166.144) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 1432 Identification: 0x171d (5917) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0xaeb8 (correct) Source: 192.168.2.16 (192.168.2.16) Destination: 198.65.166.144 (198.65.166.144) Transmission Control Protocol, Src Port: 7534 (7534), Dst Port: 35683 (35683), Seq: 951, Ack: 1497, Len: 1380 Source port: 7534 (7534) Destination port: 35683 (35683) Sequence number: 951 (relative sequence number) Next sequence number: 2331 (relative sequence number) Acknowledgement number: 1497 (relative ack number) Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 65535 Checksum: 0x2c7e (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 31134, tsecr 961303553 Session Initiation Protocol Status-Line: SIP/2.0 200 OK Status-Code: 200 Resent Packet: False Message Header Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.41ffc1f4.1;i=911 Via: SIP/2.0/TCP xxx.xxx.xxx.135:44538 From: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP from address: "HS User" 

sip:17476684616@proxy01.sipphone.com SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a To: sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP to address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28 CSeq: 1 INVITE Record-Route: sip:17476685542@198.65.166.131;transport=tcp;ftag=8fff010e644f4415a81b01004f5525f3;lr

  Contact: 

sip:17476685542@sipphone.com:55007;maddr=xxx.xxx.xxx.135;transport=tcp User-Agent: RTC/1.2 Content-Type: application/sdp Content-Length: 744 Message body Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): - 0 0 IN IP4 xxx.xxx.xxx.135 Owner Username: - Session ID: 0 Session Version: 0 Owner Network Type: IN Owner Address Type: IP4 Owner Address: xxx.xxx.xxx.135 Session Name (s): session Connection Information (c): IN IP4 xxx.xxx.xxx.135 Connection Network Type: IN Connection Address Type: IP4 Connection Address: xxx.xxx.xxx.135 Bandwidth Information (b): CT:1000 Bandwidth Modifier: CT Bandwidth Value: 1000 Time Description, active time (t): 0 0 Session Start Time: 0 Session Stop Time: 0 Media Description, name and address (m): audio 1652 RTP/AVP 97 111 112 6 0 8 4 5 3 101 Media Type: audio Media Port: 1652 Media Proto: RTP/AVP Media Format: 97 Media Format: 111 Media Format: 112 Media Format: 6 Media Format: 0 Media Format: 8 Media Format: 4 Media Format: 5 Media Format: 3 Media Format: 101 Encryption Key (k): base64:4dI9OtfFSOlW3z15eN2eORbIiIgFAqgJ5gdjdsF6zo4 Key Type: base64 Key Data: 4dI9OtfFSOlW3z15eN2eORbIiIgFAqgJ5gdjdsF6zo4 Media Attribute (a): rtpmap:97 red/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 97 red/8000 Media Attribute (a): rtpmap:111 SIREN/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 111 SIREN/16000 Media Attribute (a): fmtp:111 bitrate=16000 Media Attribute Fieldname: fmtp Media Attribute Value: 111 bitrate=16000 Media Attribute (a): rtpmap:112 G7221/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 112 G7221/16000 Media Attribute (a): fmtp:112 bitrate=24000 Media Attribute Fieldname: fmtp Media Attribute Value: 112 bitrate=24000 Media Attribute (a): rtpmap:6 DVI4/16000 Media Attribute Fieldname: rtpmap Media Attribute Value: 6 DVI4/16000 Media Attribute (a): rtpmap:0 PCMU/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 0 PCMU/8000 Media Attribute (a): rtpmap:8 PCMA/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 8 PCMA/8000 Media Attribute (a): rtpmap:4 G723/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 4 G723/8000 Media Attribute (a): rtpmap:5 DVI4/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 5 DVI4/8000 Media Attribute (a): rtpmap:3 GSM/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 3 GSM/8000 Media Attribute (a): rtpmap:101 telephone-event/8000 Media Attribute Fieldname: rtpmap Media Attribute Value: 101 telephone-event/8000 Media Attribute (a): fmtp:101 0-16 Media Attribute Fieldname: fmtp Media Attribute Value: 101 0-16 Media Attribute (a): encryption:optional Media Attribute Fieldname: encryption Media Attribute Value: optional Media Description, name and address (m): video 8286 RTP/AVP 34 31 Media Type: video Media Port: 8286 Media Proto: RTP/AVP Media Format: 34 Media Format: 31 Encryption Key (k): base64:NyQLbIpRWBJsB09qGKV79sBoeAt0MZ+swPh1IptHqGw Key Type: base64 Key Data: NyQLbIpRWBJsB09qGKV79sBoeAt0MZ+swPh1IptHqGw Media Attribute (a): rtpmap:34 H263/90000 Media Attribute Fieldname: rtpmap Media Attribute Value: 34 H263/90000 Media Attribute (a): rtpmap:31 H261/90000 Media Attribute Fieldname: rtpmap Media Attribute Value: 31 H261/90000 Media Attribute (a): encryption:optional Media Attribute Fieldname: encryption Media Attribute Value: optional Media Description, name and address (m): application 26567 tcp msdata Media Type: application Media Port: 26567 Media Proto: tcp Media Format: msdata Media Attribute (a): recvonly Media Attribute (a): encryption:optional Media Attribute Fieldname: encryption Media Attribute Value: optional

No. Time Source Destination Protocol Info 242 36.216653 192.168.2.16 198.65.166.131 SIP Request: BYE

sip:17476685542@198.65.166.131;transport=tcp;ftag=8fff010e644f4415a81b01004f5525f3;lr

Frame 242 (597 bytes on wire, 597 bytes captured) Arrival Time: Aug 16, 2004 13:15:05.874021000 Time delta from previous packet: 21.342179000 seconds Time since reference or first frame: 36.216653000 seconds Frame Number: 242 Packet Length: 597 bytes Capture Length: 597 bytes Ethernet II, Src: 00:08:a1:05:a7:17, Dst: 00:09:5b:a8:af:c8 Destination: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Source: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.2.16 (192.168.2.16), Dst Addr: 198.65.166.131 (198.65.166.131) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 583 Identification: 0x1744 (5956) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0xb1ef (correct) Source: 192.168.2.16 (192.168.2.16) Destination: 198.65.166.131 (198.65.166.131) Transmission Control Protocol, Src Port: 1078 (1078), Dst Port: 5060 (5060), Seq: 0, Ack: 0, Len: 543 Source port: 1078 (1078) Destination port: 5060 (5060) Sequence number: 0 (relative sequence number) Next sequence number: 543 (relative sequence number) Acknowledgement number: 0 (relative ack number) Header length: 20 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 64111 Checksum: 0xcaf9 (correct) Session Initiation Protocol Request-Line: BYE sip:17476685542@198.65.166.131;transport=tcp;ftag=8fff010e644f4415a81b01004f5525f3;lr

  Method: BYE
  Resent Packet: False

Message Header Via: SIP/2.0/TCP xxx.xxx.xxx.135:55007 Max-Forwards: 70 From: sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP from address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 To: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP to address: "HS User" <sip:17476684616@proxy01.sipphone.com>
      SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a
  Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28
  CSeq: 1 BYE
  Route: 

sip:17476684616@proxy01.sipphone.com:44538;maddr=xxx.xxx.xxx.135;transport=tcp;nat=yes

  User-Agent: RTC/1.2
  Content-Length: 0

No. Time Source Destination Protocol Info 249 36.689918 198.65.166.144 192.168.2.16 SIP Request: BYE sip:xxx.xxx.xxx.135:55007;transport=tcp

Frame 249 (698 bytes on wire, 698 bytes captured) Arrival Time: Aug 16, 2004 13:15:06.347286000 Time delta from previous packet: 0.473265000 seconds Time since reference or first frame: 36.689918000 seconds Frame Number: 249 Packet Length: 698 bytes Capture Length: 698 bytes Ethernet II, Src: 00:09:5b:a8:af:c8, Dst: 00:08:a1:05:a7:17 Destination: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Source: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Type: IP (0x0800) Internet Protocol, Src Addr: 198.65.166.144 (198.65.166.144), Dst Addr: 192.168.2.16 (192.168.2.16) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x10 (DSCP 0x04: Unknown DSCP; ECN: 0x00) 0001 00.. = Differentiated Services Codepoint: Unknown (0x04) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 684 Identification: 0x499e (18846) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 46 Protocol: TCP (0x06) Header checksum: 0xd113 (correct) Source: 198.65.166.144 (198.65.166.144) Destination: 192.168.2.16 (192.168.2.16) Transmission Control Protocol, Src Port: 35749 (35749), Dst Port: 7534 (7534), Seq: 1, Ack: 1, Len: 632 Source port: 35749 (35749) Destination port: 7534 (7534) Sequence number: 1 (relative sequence number) Next sequence number: 633 (relative sequence number) Acknowledgement number: 1 (relative ack number) Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 5808 Checksum: 0x04f6 (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 961305922, tsecr 0 Session Initiation Protocol Request-Line: BYE sip:xxx.xxx.xxx.135:55007;transport=tcp SIP/2.0 Method: BYE Resent Packet: False Message Header Record-Route: sip:17476685542@198.65.166.131;transport=tcp;ftag=161092ccf5a84e5ab90efe06a8771910;lr

  Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.51ffc1f4.1;i=421
  Via: SIP/2.0/TCP xxx.xxx.xxx.135:55007
  Max-Forwards: 69
  From: 

sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP from address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 To: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP to address: "HS User" <sip:17476684616@proxy01.sipphone.com>
      SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a
  Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28
  CSeq: 1 BYE
  User-Agent: RTC/1.2
  Content-Length: 0
  P-hint: usrloc routed
  P-RTP-Proxy: YES
  P-Behind-NAT: Yes

No. Time Source Destination Protocol Info 255 37.002771 192.168.2.16 198.65.166.144 SIP Status: 481 Call Leg/Transaction Does Not Exist

Frame 255 (515 bytes on wire, 515 bytes captured) Arrival Time: Aug 16, 2004 13:15:06.660139000 Time delta from previous packet: 0.312853000 seconds Time since reference or first frame: 37.002771000 seconds Frame Number: 255 Packet Length: 515 bytes Capture Length: 515 bytes Ethernet II, Src: 00:08:a1:05:a7:17, Dst: 00:09:5b:a8:af:c8 Destination: 00:09:5b:a8:af:c8 (Netgear_a8:af:c8) Source: 00:08:a1:05:a7:17 (CnetTech_05:a7:17) Type: IP (0x0800) Internet Protocol, Src Addr: 192.168.2.16 (192.168.2.16), Dst Addr: 198.65.166.144 (198.65.166.144) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 501 Identification: 0x1749 (5961) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0xb22f (correct) Source: 192.168.2.16 (192.168.2.16) Destination: 198.65.166.144 (198.65.166.144) Transmission Control Protocol, Src Port: 7534 (7534), Dst Port: 35749 (35749), Seq: 1, Ack: 633, Len: 449 Source port: 7534 (7534) Destination port: 35749 (35749) Sequence number: 1 (relative sequence number) Next sequence number: 450 (relative sequence number) Acknowledgement number: 633 (relative ack number) Header length: 32 bytes Flags: 0x0018 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 64903 Checksum: 0x94a1 (correct) Options: (12 bytes) NOP NOP Time stamp: tsval 31355, tsecr 961305922 Session Initiation Protocol Status-Line: SIP/2.0 481 Call Leg/Transaction Does Not Exist Status-Code: 481 Resent Packet: False Message Header Via: SIP/2.0/TCP 198.65.166.131;branch=z9hG4bKaa22.51ffc1f4.1;i=421 Via: SIP/2.0/TCP xxx.xxx.xxx.135:55007 From: sip:17476685542@sipphone.com;tag=161092ccf5a84e5ab90efe06a8771910 SIP from address: sip:17476685542@sipphone.com SIP tag: 161092ccf5a84e5ab90efe06a8771910 To: "HS User" sip:17476684616@proxy01.sipphone.com;tag=8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a

      SIP to address: "HS User" <sip:17476684616@proxy01.sipphone.com>
      SIP tag: 8fff010e644f4415a81b01004f5525f3;epid=e062c2bd1a
  Call-ID: 50ff745bbe664826af92e6820b46acda@192.168.2.28
  CSeq: 1 BYE
  User-Agent: RTC/1.2
  Content-Length: 0

SIP/2.0

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