[Serusers] SER originating packets / incorrect checksum

Klaus Darilion klaus.mailinglists at pernau.at
Thu Sep 8 00:47:12 CEST 2005


did you sniff at the PC running ser? Sometmes the checksum is calculated 
  in the NIC, thus tcpdump can't see them.

klaus

Jose Delancy wrote:

> Though conversations do to work, when I look at my raw packets I see that I have an incorrect checksum on most packets originating from my SER box.  I'm guessing there's some kind of ACK or loose_route issue here, but I am unable to determine what it is.
> 
> I have attached the dump.  Please advise.
> 
> 
> ------------------------------------------------------------------------
> 
> Frame 3 (667 bytes on wire, 667 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:38.119886000
>     Time delta from previous packet: 4.481842000 seconds
>     Time since reference or first frame: 4.490287000 seconds
>     Frame Number: 3
>     Packet Length: 667 bytes
>     Capture Length: 667 bytes
>     Protocols in frame: eth:ip:udp:sip:sdp
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [ORIGINORIGIN] ([ORIGINORIGIN]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 653
>     Identification: 0x4e77 (20087)
>     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: 236
>     Protocol: UDP (0x11)
>     Header checksum: 0xd847 [correct]
>     Source: [ORIGINORIGIN] ([ORIGINORIGIN])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 633
>     Checksum: 0xe490 [correct]
> Session Initiation Protocol
>     Request-Line: INVITE sip:15551234567@[SERSERSERSER]:5060 SIP/2.0
>         Method: INVITE
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567<sip:15551234567@[SERSERSERSER]:5060>
>             SIP Display info: 15551234567
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>         From: 15559876543<sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Max-Forwards: 70
>         Subject: ORIGIN
>         Contact: <sip:15559876543@[ORIGINORIGIN]:5060>
>             Contact Binding: <sip:15559876543@[ORIGINORIGIN]:5060>
>                 URI: <sip:15559876543@[ORIGINORIGIN]:5060>
>                     SIP contact address: sip:15559876543@[ORIGINORIGIN]:5060
>         Content-Type: application/sdp
>         Content-Length: 212
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): username 3335037699 0 IN IP4 [CREATORCREATOR]
>                 Owner Username: username
>                 Session ID: 3335037699
>                 Session Version: 0
>                 Owner Network Type: IN
>                 Owner Address Type: IP4
>                 Owner Address: [CREATORCREATOR]
>             Session Name (s): username
>             Connection Information (c): IN IP4 [CREATORCREATOR]
>                 Connection Network Type: IN
>                 Connection Address Type: IP4
>                 Connection Address: [CREATORCREATOR]
>             Time Description, active time (t): 3335037699 0
>                 Session Start Time: 3335037699
>                 Session Stop Time: 0
>             Media Description, name and address (m): audio 46786 RTP/AVP 18
>                 Media Type: audio
>                 Media Port: 46786
>                 Media Proto: RTP/AVP
>                 Media Format: ITU-T G.729
>             Media Attribute (a): rtpmap:18 G729/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 18 G729/8000
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 101 telephone-event/8000
>             Media Attribute (a): sendrecv
> 
> Frame 4 (593 bytes on wire, 593 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:38.319683000
>     Time delta from previous packet: 0.199797000 seconds
>     Time since reference or first frame: 4.690084000 seconds
>     Frame Number: 4
>     Packet Length: 593 bytes
>     Capture Length: 593 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [ORIGINORIGIN] ([ORIGINORIGIN])
>     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: 579
>     Identification: 0x10e4 (4324)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0xc215 [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [ORIGINORIGIN] ([ORIGINORIGIN])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 559
>     Checksum: 0x67e1 [incorrect, should be 0x1814]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 100 trying -- your call is important to us
>         Status-Code: 100
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567<sip:15551234567@[SERSERSERSER]:5060>
>             SIP Display info: 15551234567
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>         From: 15559876543<sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Server: Sip EXpress router (0.9.3 (i386/linux))
>         Content-Length: 0
>         Warning: 392 [SERSERSERSER]:5060 "Noisy feedback tells:  pid=4089 req_src_ip=[ORIGINORIGIN] req_src_port=5060 in_uri=sip:15551234567@[SERSERSERSER]:5060 out_uri=sip:5551234567@[DESTINATIONDESTINATION]:5060 via_cnt==1"
> 
> Frame 5 (784 bytes on wire, 784 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:38.319795000
>     Time delta from previous packet: 0.000112000 seconds
>     Time since reference or first frame: 4.690196000 seconds
>     Frame Number: 5
>     Packet Length: 784 bytes
>     Capture Length: 784 bytes
>     Protocols in frame: eth:ip:udp:sip:sdp
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     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: 770
>     Identification: 0x10e5 (4325)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0x3175 [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 750
>     Checksum: 0xf880 [incorrect, should be 0xcf39]
> Session Initiation Protocol
>     Request-Line: INVITE sip:5551234567@[DESTINATIONDESTINATION]:5060 SIP/2.0
>         Method: INVITE
>         Resent Packet: False
>     Message Header
>         Record-Route: <sip:[SERSERSERSER];ftag=1126048899;lr=on>
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=z9hG4bK1458.76e37293.0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567<sip:15551234567@[SERSERSERSER]:5060>
>             SIP Display info: 15551234567
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>         From: 15559876543<sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Max-Forwards: 16
>         Subject: ORIGIN
>         Contact: <sip:15559876543@[ORIGINORIGIN]:5060>
>             Contact Binding: <sip:15559876543@[ORIGINORIGIN]:5060>
>                 URI: <sip:15559876543@[ORIGINORIGIN]:5060>
>                     SIP contact address: sip:15559876543@[ORIGINORIGIN]:5060
>         Content-Type: application/sdp
>         Content-Length: 212
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): username 3335037699 0 IN IP4 [CREATORCREATOR]
>                 Owner Username: username
>                 Session ID: 3335037699
>                 Session Version: 0
>                 Owner Network Type: IN
>                 Owner Address Type: IP4
>                 Owner Address: [CREATORCREATOR]
>             Session Name (s): username
>             Connection Information (c): IN IP4 [CREATORCREATOR]
>                 Connection Network Type: IN
>                 Connection Address Type: IP4
>                 Connection Address: [CREATORCREATOR]
>             Time Description, active time (t): 3335037699 0
>                 Session Start Time: 3335037699
>                 Session Stop Time: 0
>             Media Description, name and address (m): audio 46786 RTP/AVP 18
>                 Media Type: audio
>                 Media Port: 46786
>                 Media Proto: RTP/AVP
>                 Media Format: ITU-T G.729
>             Media Attribute (a): rtpmap:18 G729/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 18 G729/8000
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 101 telephone-event/8000
>             Media Attribute (a): sendrecv
> 
> Frame 6 (373 bytes on wire, 373 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:38.393215000
>     Time delta from previous packet: 0.073420000 seconds
>     Time since reference or first frame: 4.763616000 seconds
>     Frame Number: 6
>     Packet Length: 373 bytes
>     Capture Length: 373 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 359
>     Identification: 0x98de (39134)
>     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: 238
>     Protocol: UDP (0x11)
>     Header checksum: 0xfd25 [correct]
>     Source: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 339
>     Checksum: 0xef96 [correct]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 100 Trying
>         Status-Code: 100
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=z9hG4bK1458.76e37293.0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Content-Length: 0
> 
> Frame 15 (684 bytes on wire, 684 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:43.510711000
>     Time delta from previous packet: 0.682532000 seconds
>     Time since reference or first frame: 9.881112000 seconds
>     Frame Number: 15
>     Packet Length: 684 bytes
>     Capture Length: 684 bytes
>     Protocols in frame: eth:ip:udp:sip:sdp
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 670
>     Identification: 0x98e1 (39137)
>     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: 238
>     Protocol: UDP (0x11)
>     Header checksum: 0xfbeb [correct]
>     Source: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 650
>     Checksum: 0x2821 [correct]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>         Status-Code: 200
>         Resent Packet: False
>     Message Header
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Contact: sip:5551234567@[DESTINATIONDESTINATION]:5060
>             Contact Binding: sip:5551234567@[DESTINATIONDESTINATION]:5060
>                 URI: sip:5551234567@[DESTINATIONDESTINATION]:5060\r
>                     SIP contact address: sip:5551234567@[DESTINATIONDESTINATION]:5060\r
>         Content-Type: application/sdp
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=z9hG4bK1458.76e37293.0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         Record-Route: <sip:[SERSERSERSER];ftag=1126048899;lr=on>
>         Content-Length: 160
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): version 1234 6726 IN IP4 [CREATOR2CREATOR2]
>                 Owner Username: version
>                 Session ID: 1234
>                 Session Version: 6726
>                 Owner Network Type: IN
>                 Owner Address Type: IP4
>                 Owner Address: [CREATOR2CREATOR2]
>             Session Name (s): sip call
>             Connection Information (c): IN IP4 [CREATOR2CREATOR2]
>                 Connection Network Type: IN
>                 Connection Address Type: IP4
>                 Connection Address: [CREATOR2CREATOR2]
>             Time Description, active time (t): 0 0
>                 Session Start Time: 0
>                 Session Stop Time: 0
>             Media Description, name and address (m): audio 17542 RTP/AVP 18
>                 Media Type: audio
>                 Media Port: 17542
>                 Media Proto: RTP/AVP
>                 Media Format: ITU-T G.729
>             Media Attribute (a): rtpmap:18 G729/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 18 G729/8000
>             Media Attribute (a): fmtp:18 annexb=no
>                 Media Attribute Fieldname: fmtp
>                 Media Attribute Value: 18 annexb=no
> 
> Frame 16 (624 bytes on wire, 624 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:43.517182000
>     Time delta from previous packet: 0.006471000 seconds
>     Time since reference or first frame: 9.887583000 seconds
>     Frame Number: 16
>     Packet Length: 624 bytes
>     Capture Length: 624 bytes
>     Protocols in frame: eth:ip:udp:sip:sdp
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [ORIGINORIGIN] ([ORIGINORIGIN])
>     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: 610
>     Identification: 0x10ea (4330)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0xc1f0 [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [ORIGINORIGIN] ([ORIGINORIGIN])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 590
>     Checksum: 0x6800 [incorrect, should be 0x61da]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>         Status-Code: 200
>         Resent Packet: False
>     Message Header
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 INVITE
>         Contact: sip:5551234567@[DESTINATIONDESTINATION]:5060
>             Contact Binding: sip:5551234567@[DESTINATIONDESTINATION]:5060
>                 URI: sip:5551234567@[DESTINATIONDESTINATION]:5060\r
>                     SIP contact address: sip:5551234567@[DESTINATIONDESTINATION]:5060\r
>         Content-Type: application/sdp
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         Record-Route: <sip:[SERSERSERSER];ftag=1126048899;lr=on>
>         Content-Length: 160
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): version 1234 6726 IN IP4 [CREATOR2CREATOR2]
>                 Owner Username: version
>                 Session ID: 1234
>                 Session Version: 6726
>                 Owner Network Type: IN
>                 Owner Address Type: IP4
>                 Owner Address: [CREATOR2CREATOR2]
>             Session Name (s): sip call
>             Connection Information (c): IN IP4 [CREATOR2CREATOR2]
>                 Connection Network Type: IN
>                 Connection Address Type: IP4
>                 Connection Address: [CREATOR2CREATOR2]
>             Time Description, active time (t): 0 0
>                 Session Start Time: 0
>                 Session Stop Time: 0
>             Media Description, name and address (m): audio 17542 RTP/AVP 18
>                 Media Type: audio
>                 Media Port: 17542
>                 Media Proto: RTP/AVP
>                 Media Format: ITU-T G.729
>             Media Attribute (a): rtpmap:18 G729/8000
>                 Media Attribute Fieldname: rtpmap
>                 Media Attribute Value: 18 G729/8000
>             Media Attribute (a): fmtp:18 annexb=no
>                 Media Attribute Fieldname: fmtp
>                 Media Attribute Value: 18 annexb=no
> 
> Frame 17 (365 bytes on wire, 365 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:43.595159000
>     Time delta from previous packet: 0.077977000 seconds
>     Time since reference or first frame: 9.965560000 seconds
>     Frame Number: 17
>     Packet Length: 365 bytes
>     Capture Length: 365 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [ORIGINORIGIN] ([ORIGINORIGIN]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 351
>     Identification: 0x4e79 (20089)
>     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: 236
>     Protocol: UDP (0x11)
>     Header checksum: 0xd973 [correct]
>     Source: [ORIGINORIGIN] ([ORIGINORIGIN])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 331
>     Checksum: 0xa524 [correct]
> Session Initiation Protocol
>     Request-Line: ACK sip:[SERSERSERSER];lr=on SIP/2.0
>         Method: ACK
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 ACK
>         Max-Forwards: 70
>         Content-Length: 0
> 
> Frame 18 (462 bytes on wire, 462 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:43.616640000
>     Time delta from previous packet: 0.021481000 seconds
>     Time since reference or first frame: 9.987041000 seconds
>     Frame Number: 18
>     Packet Length: 462 bytes
>     Capture Length: 462 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     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: 448
>     Identification: 0x10eb (4331)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0x32b1 [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 428
>     Checksum: 0xf73e [incorrect, should be 0x4f55]
> Session Initiation Protocol
>     Request-Line: ACK sip:[DESTINATIONDESTINATION];lr=on SIP/2.0
>         Method: ACK
>         Resent Packet: False
>     Message Header
>         Record-Route: <sip:[SERSERSERSER];ftag=1126048899;lr=on>
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 1 ACK
>         Max-Forwards: 16
>         Content-Length: 0
> 
> Frame 42 (376 bytes on wire, 376 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:52.634007000
>     Time delta from previous packet: 0.067331000 seconds
>     Time since reference or first frame: 19.004408000 seconds
>     Frame Number: 42
>     Packet Length: 376 bytes
>     Capture Length: 376 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [ORIGINORIGIN] ([ORIGINORIGIN]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 362
>     Identification: 0x4e7f (20095)
>     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: 236
>     Protocol: UDP (0x11)
>     Header checksum: 0xd962 [correct]
>     Source: [ORIGINORIGIN] ([ORIGINORIGIN])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 342
>     Checksum: 0x58f3 [correct]
> Session Initiation Protocol
>     Request-Line: BYE sip:15551234567@[SERSERSERSER]:5060 SIP/2.0
>         Method: BYE
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 2 BYE
>         Max-Forwards: 70
>         Content-Length: 0
> 
> Frame 43 (493 bytes on wire, 493 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:52.660881000
>     Time delta from previous packet: 0.026874000 seconds
>     Time since reference or first frame: 19.031282000 seconds
>     Frame Number: 43
>     Packet Length: 493 bytes
>     Capture Length: 493 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     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: 479
>     Identification: 0x10f7 (4343)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0x3286 [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 459
>     Checksum: 0xf75d [incorrect, should be 0x9fb6]
> Session Initiation Protocol
>     Request-Line: BYE sip:5551234567@[DESTINATIONDESTINATION]:5060 SIP/2.0
>         Method: BYE
>         Resent Packet: False
>     Message Header
>         Record-Route: <sip:[SERSERSERSER];ftag=1126048899;lr=on>
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=z9hG4bKe358.270dac87.0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 2 BYE
>         Max-Forwards: 16
>         Content-Length: 0
> 
> Frame 44 (388 bytes on wire, 388 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:52.733945000
>     Time delta from previous packet: 0.073064000 seconds
>     Time since reference or first frame: 19.104346000 seconds
>     Frame Number: 44
>     Packet Length: 388 bytes
>     Capture Length: 388 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC]), Dst: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Destination: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Source: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION]), Dst: [SERSERSERSER] ([SERSERSERSER])
>     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: 374
>     Identification: 0x98e8 (39144)
>     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: 238
>     Protocol: UDP (0x11)
>     Header checksum: 0xfd0c [correct]
>     Source: [DESTINATIONDESTINATION] ([DESTINATIONDESTINATION])
>     Destination: [SERSERSERSER] ([SERSERSERSER])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 354
>     Checksum: 0x275e [correct]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>         Status-Code: 200
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [SERSERSERSER];branch=z9hG4bKe358.270dac87.0
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 2 BYE
>         Content-Length: 0
> 
> Frame 45 (328 bytes on wire, 328 bytes captured)
>     Arrival Time: Sep  6, 2005 16:15:52.744301000
>     Time delta from previous packet: 0.010356000 seconds
>     Time since reference or first frame: 19.114702000 seconds
>     Frame Number: 45
>     Packet Length: 328 bytes
>     Capture Length: 328 bytes
>     Protocols in frame: eth:ip:udp:sip
> Ethernet II, Src: Intel_[SER_MAC] (00:0e:0c:[SER_MAC]), Dst: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Destination: Cisco_[ORG_MAC] (00:05:01:[ORG_MAC])
>     Source: Intel_[SER_MAC] (00:0e:0c:[SER_MAC])
>     Type: IP (0x0800)
> Internet Protocol, Src: [SERSERSERSER] ([SERSERSERSER]), Dst: [ORIGINORIGIN] ([ORIGINORIGIN])
>     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: 314
>     Identification: 0x10f8 (4344)
>     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: 64
>     Protocol: UDP (0x11)
>     Header checksum: 0xc30a [correct]
>     Source: [SERSERSERSER] ([SERSERSERSER])
>     Destination: [ORIGINORIGIN] ([ORIGINORIGIN])
> User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060)
>     Source port: 5060 (5060)
>     Destination port: 5060 (5060)
>     Length: 294
>     Checksum: 0x66d8 [incorrect, should be 0x4fb2]
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>         Status-Code: 200
>         Resent Packet: False
>     Message Header
>         Via: SIP/2.0/UDP [ORIGINORIGIN]:5060
>         From: 15559876543 <sip:15559876543@[ORIGINORIGIN]:5060>;tag=1126048899
>             SIP Display info: 15559876543 
>             SIP from address: sip:15559876543@[ORIGINORIGIN]:5060
>             SIP tag: 1126048899
>         To: 15551234567 <sip:15551234567@[SERSERSERSER]:5060>;tag=3335037343-448857
>             SIP Display info: 15551234567 
>             SIP to address: sip:15551234567@[SERSERSERSER]:5060
>             SIP tag: 3335037343-448857
>         Call-ID: F9CE10731F2C11DA85380000004213C4@[ORIGINORIGIN]
>         CSeq: 2 BYE
>         Content-Length: 0
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
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