[Users] NAT problem for PRACK replies

Ovidiu Sas sip.nslu at gmail.com
Fri Feb 9 03:08:53 CET 2007


Hi Jeff,

You will need to force the rport for the ACK.
Compare the Via header in the INVITE against the Via header in PRACK.


Hope this helps,
Ovidiu Sas

On 2/8/07, Jeff Williams <jeffw at globaldial.com> wrote:
> Hi,
>
> I seem to have a problem replies to PRACKs from NATed UAs. The UA is
> behind the NAT on a private IP listening on port 5060. This port gets
> mapped to 1350 on the external IP by the NAT device.
>
> The INVITE goes out fine and gets the contact updated for NAT by:
>
>     if (client_nat_test("3")) {
>         setflag(7);
>         force_rport();
>         fix_contact();
>     };
>
> This then receives a 183 reply to which it sends a PRACK. However, the
> 200 response to the PRACK gets sent to port 5060 on the external IP =>
> which of course doesn't get to the UA.
>
> Is there something I'm missing in my config? I have attached a trace of
> the call setup.
>
> Jeff
>
> No.     Time        Source                Destination           Protocol Info
>   19424 6.838985    203.24.54.17          202.74.164.44         SIP/SDP  Request: INVITE sip:0893680949 at proxy.sipone.com;user=phone, with session description
>
> Frame 19424 (941 bytes on wire, 941 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: INVITE sip:0893680949 at proxy.sipone.com;user=phone SIP/2.0
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bK26f185af4ccc0d42
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 1 INVITE
>         Max-Forwards: 70
>         Contact: Jeff <sip:610089001 at 192.168.10.30:5060;user=phone;transport=udp>
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Expires: 300
>         Content-Length: 288
>         Content-Type: application/sdp
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): 610089001 147590 147590 IN IP4 192.168.10.30
>             Session Name (s): Cisco 7912 SIP Call
>             Connection Information (c): IN IP4 192.168.10.30
>             Time Description, active time (t): 0 0
>             Media Description, name and address (m): audio 16384 RTP/AVP 0 18 8 101
>             Media Attribute (a): rtpmap:0 PCMU/8000/1
>             Media Attribute (a): rtpmap:18 G729/8000/1
>             Media Attribute (a): fmtp:18 annexb=yes
>             Media Attribute (a): rtpmap:8 PCMA/8000/1
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>             Media Attribute (a): fmtp:101 0-15
>
> No.     Time        Source                Destination           Protocol Info
>   19428 6.842541    202.74.164.44         203.24.54.17          SIP      Status: 100 trying -- your call is important to us
>
> Frame 19428 (655 bytes on wire, 655 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: 1350 (1350)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 100 trying -- your call is important to us
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bK26f185af4ccc0d42;rport=1350;received=203.24.54.17
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 1 INVITE
>         Server: OpenSer (1.1.1-tls (i386/linux))
>         Content-Length: 0
>         Warning: 392 202.74.164.44:5060 "Noisy feedback tells:  pid=11082 req_src_ip=203.24.54.17 req_src_port=1350 in_uri=sip:0893680949 at proxy.sipone.com;user=phone out_uri=sip:61893680949 at 202.74.164.72:5060;user=phone via_cnt==1"
>
> No.     Time        Source                Destination           Protocol Info
>   19429 6.842579    202.74.164.44         202.74.164.72         SIP/SDP  Request: INVITE sip:61893680949 at 202.74.164.72:5060;user=phone, with session description
>
> Frame 19429 (1148 bytes on wire, 1148 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 202.74.164.72 (202.74.164.72)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: INVITE sip:61893680949 at 202.74.164.72:5060;user=phone SIP/2.0
>     Message Header
>         Record-Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK7a7e.3cf74a67.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;rport=1350;received=203.24.54.17;branch=z9hG4bK26f185af4ccc0d42
>         From: Jeff <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 1 INVITE
>         Max-Forwards: 69
>         Contact: Jeff <sip:610089001 at 203.24.54.17:1350;user=phone;transport=udp>
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Expires: 300
>         Content-Length: 288
>         Content-Type: application/sdp
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): 610089001 147590 147590 IN IP4 192.168.10.30
>             Session Name (s): Cisco 7912 SIP Call
>             Connection Information (c): IN IP4 202.74.164.44
>             Time Description, active time (t): 0 0
>             Media Description, name and address (m): audio 63054 RTP/AVP 0 18 8 101
>             Media Attribute (a): rtpmap:0 PCMU/8000/1
>             Media Attribute (a): rtpmap:18 G729/8000/1
>             Media Attribute (a): fmtp:18 annexb=yes
>             Media Attribute (a): rtpmap:8 PCMA/8000/1
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>             Media Attribute (a): fmtp:101 0-15
>
> No.     Time        Source                Destination           Protocol Info
>   19450 6.860058    202.74.164.72         202.74.164.44         SIP      Status: 100 Trying
>
> Frame 19450 (445 bytes on wire, 445 bytes captured)
> Ethernet II, Src: 00:12:44:c0:cc:1b, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 202.74.164.72 (202.74.164.72), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 100 Trying
>     Message Header
>         From: "Jeff" <sip:0892209080 at sipone.com:5060>;tag=1166274291
>         To: <sip:0893680949 at 202.74.164.72:5060;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         CSeq: 1 INVITE
>         Call-ID: 3478456911 at 192.168.10.30
>         Via: SIP/2.0/UDP 202.74.164.44:5060;branch=z9hG4bK7a7e.3cf74a67.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;rport=1350;received=203.24.54.17;branch=z9hG4bK26f185af4ccc0d42
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21001 8.339800    202.74.164.72         202.74.164.44         SIP/SDP  Status: 183 Session Progress, with session description
>
> Frame 21001 (1064 bytes on wire, 1064 bytes captured)
> Ethernet II, Src: 00:12:44:c0:cc:1b, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 202.74.164.72 (202.74.164.72), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 183 Session Progress
>     Message Header
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK7a7e.3cf74a67.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;rport=1350;received=203.24.54.17;branch=z9hG4bK26f185af4ccc0d42
>         From: "Jeff" <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:07 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 1 INVITE
>         Require: 100rel
>         RSeq: 3067
>         Contact: <sip:610089001 at 202.74.164.72:5060;user=phone>
>         Record-Route: <sip:202.74.164.72:5060;lr>
>         Record-Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->
>         Content-Type: application/sdp
>         Content-Disposition: session;handling=required
>         Content-Length: 214
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): CiscoSystemsSIP-GW-UserAgent 4912 6655 IN IP4 202.74.164.72
>             Session Name (s): SIP Call
>             Connection Information (c): IN IP4 202.74.164.72
>             Time Description, active time (t): 0 0
>             Media Description, name and address (m): audio 27182 RTP/AVP 0 101
>             Media Attribute (a): rtpmap:0 PCMU/8000
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>             Media Attribute (a): fmtp:101 0-15
>
> No.     Time        Source                Destination           Protocol Info
>   21003 8.341340    202.74.164.44         203.24.54.17          SIP/SDP  Status: 183 Session Progress, with session description
>
> Frame 21003 (1016 bytes on wire, 1016 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: 1350 (1350)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 183 Session Progress
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;rport=1350;received=203.24.54.17;branch=z9hG4bK26f185af4ccc0d42
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:07 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 1 INVITE
>         Require: 100rel
>         RSeq: 3067
>         Contact: <sip:610089001 at 202.74.164.72:5060;user=phone>
>         Record-Route: <sip:202.74.164.72:5060;lr>
>         Record-Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->
>         Content-Type: application/sdp
>         Content-Disposition: session;handling=required
>         Content-Length: 214
>     Message body
>         Session Description Protocol
>             Session Description Protocol Version (v): 0
>             Owner/Creator, Session Id (o): CiscoSystemsSIP-GW-UserAgent 4912 6655 IN IP4 202.74.164.72
>             Session Name (s): SIP Call
>             Connection Information (c): IN IP4 202.74.164.44
>             Time Description, active time (t): 0 0
>             Media Description, name and address (m): audio 63054 RTP/AVP 0 101
>             Media Attribute (a): rtpmap:0 PCMU/8000
>             Media Attribute (a): rtpmap:101 telephone-event/8000
>             Media Attribute (a): fmtp:101 0-15
>
> No.     Time        Source                Destination           Protocol Info
>   21044 8.397481    203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 21044 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21045 8.397734    202.74.164.44         202.74.164.72         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 21045 (725 bytes on wire, 725 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 202.74.164.72 (202.74.164.72)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Record-Route: <sip:202.74.164.44;lr=on;ftag=1166274291>
>         Route: <sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK4a7e.215a51c5.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 69
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21060 8.419413    202.74.164.72         202.74.164.44         SIP      Status: 200 OK
>
> Frame 21060 (489 bytes on wire, 489 bytes captured)
> Ethernet II, Src: 00:12:44:c0:cc:1b, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 202.74.164.72 (202.74.164.72), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>     Message Header
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK4a7e.215a51c5.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: "Jeff" <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:08 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 2 PRACK
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21061 8.419532    202.74.164.44         203.24.54.17          SIP      Status: 200 OK
>
> Frame 21061 (441 bytes on wire, 441 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:08 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 2 PRACK
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21070 8.429213    203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 21070 (469 bytes on wire, 469 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
> No.     Time        Source                Destination           Protocol Info
>   21611 8.897497    203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 21611 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   21612 8.897734    202.74.164.44         203.24.54.17          SIP      Status: 500 I'm terribly sorry, server error occurred (1/SL)
>
> Frame 21612 (649 bytes on wire, 649 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed;received=203.24.54.17
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         Server: OpenSer (1.1.1-tls (i386/linux))
>         Content-Length: 0
>         Warning: 392 202.74.164.44:5060 "Noisy feedback tells:  pid=11082 req_src_ip=203.24.54.17 req_src_port=1350 in_uri=sip:610089001 at 202.74.164.72 out_uri=sip:610089001 at 202.74.164.72 via_cnt==1"
>
> No.     Time        Source                Destination           Protocol Info
>   21625 8.909606    203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 21625 (590 bytes on wire, 590 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
> No.     Time        Source                Destination           Protocol Info
>   22692 9.898092    203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 22692 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   22693 9.898343    202.74.164.44         203.24.54.17          SIP      Status: 500 I'm terribly sorry, server error occurred (1/SL)
>
> Frame 22693 (649 bytes on wire, 649 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed;received=203.24.54.17
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         Server: OpenSer (1.1.1-tls (i386/linux))
>         Content-Length: 0
>         Warning: 392 202.74.164.44:5060 "Noisy feedback tells:  pid=11078 req_src_ip=203.24.54.17 req_src_port=1350 in_uri=sip:610089001 at 202.74.164.72 out_uri=sip:610089001 at 202.74.164.72 via_cnt==1"
>
> No.     Time        Source                Destination           Protocol Info
>   22702 9.912093    203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 22702 (590 bytes on wire, 590 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
> No.     Time        Source                Destination           Protocol Info
>   24851 11.899557   203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 24851 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   24853 11.899808   202.74.164.44         203.24.54.17          SIP      Status: 500 I'm terribly sorry, server error occurred (1/SL)
>
> Frame 24853 (649 bytes on wire, 649 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed;received=203.24.54.17
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         Server: OpenSer (1.1.1-tls (i386/linux))
>         Content-Length: 0
>         Warning: 392 202.74.164.44:5060 "Noisy feedback tells:  pid=11081 req_src_ip=203.24.54.17 req_src_port=1350 in_uri=sip:610089001 at 202.74.164.72 out_uri=sip:610089001 at 202.74.164.72 via_cnt==1"
>
> No.     Time        Source                Destination           Protocol Info
>   24866 11.911720   203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 24866 (590 bytes on wire, 590 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
> No.     Time        Source                Destination           Protocol Info
>   27365 13.900358   203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 27365 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   27366 13.900630   202.74.164.44         202.74.164.72         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 27366 (725 bytes on wire, 725 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 202.74.164.72 (202.74.164.72)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Record-Route: <sip:202.74.164.44;lr=on;ftag=1166274291>
>         Route: <sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK4a7e.315a51c5.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 69
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   27426 13.938284   202.74.164.72         202.74.164.44         SIP      Status: 200 OK
>
> Frame 27426 (489 bytes on wire, 489 bytes captured)
> Ethernet II, Src: 00:12:44:c0:cc:1b, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 202.74.164.72 (202.74.164.72), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>     Message Header
>         Via: SIP/2.0/UDP 202.74.164.44;branch=z9hG4bK4a7e.315a51c5.0
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: "Jeff" <sip:0892209080 at sipone.com>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:14 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 2 PRACK
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   27427 13.938422   202.74.164.44         203.24.54.17          SIP      Status: 200 OK
>
> Frame 27427 (441 bytes on wire, 441 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 200 OK
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;received=203.24.54.17;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Date: Fri, 09 Feb 2007 00:15:14 GMT
>         Call-ID: 3478456911 at 192.168.10.30
>         Server: Cisco-SIPGateway/IOS-12.x
>         CSeq: 2 PRACK
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   27438 13.947350   203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 27438 (469 bytes on wire, 469 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
> No.     Time        Source                Destination           Protocol Info
>   30349 15.901399   203.24.54.17          202.74.164.44         SIP      Request: PRACK sip:610089001 at 202.74.164.72
>
> Frame 30349 (711 bytes on wire, 711 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> User Datagram Protocol, Src Port: 1350 (1350), Dst Port: sip (5060)
> Session Initiation Protocol
>     Request-Line: PRACK sip:610089001 at 202.74.164.72 SIP/2.0
>     Message Header
>         Route: <sip:202.74.164.44;lr=on;ftag=1166274291;nat=yes;vsf=AAAAAAYJCQIKCQkACXAwAQYIFkAWRxMAA2UuY29tO3VzZXI9cGhvbmU->,<sip:202.74.164.72:5060;lr>
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         RAck: 3067 1 INVITE
>         Max-Forwards: 70
>         User-Agent: Cisco-CP7912/8.0.1-060412A
>         Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE
>         Supported: replaces, 100rel
>         Content-Length: 0
>
> No.     Time        Source                Destination           Protocol Info
>   30350 15.901638   202.74.164.44         203.24.54.17          SIP      Status: 500 I'm terribly sorry, server error occurred (1/SL)
>
> Frame 30350 (649 bytes on wire, 649 bytes captured)
> Ethernet II, Src: 00:07:e9:11:47:25, Dst: 00:12:44:c0:cc:1b
> Internet Protocol, Src Addr: 202.74.164.44 (202.74.164.44), Dst Addr: 203.24.54.17 (203.24.54.17)
> User Datagram Protocol, Src Port: sip (5060), Dst Port: sip (5060)
> Session Initiation Protocol
>     Status-Line: SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)
>     Message Header
>         Via: SIP/2.0/UDP 192.168.10.30:5060;branch=z9hG4bKeccd468d60f015ed;received=203.24.54.17
>         From: Jeff <sip:610089001 at proxy.sipone.com;user=phone>;tag=1166274291
>         To: <sip:0893680949 at proxy.sipone.com;user=phone>;tag=669b638bbf9e0903fd8a2a66
>         Call-ID: 3478456911 at 192.168.10.30
>         CSeq: 2 PRACK
>         Server: OpenSer (1.1.1-tls (i386/linux))
>         Content-Length: 0
>         Warning: 392 202.74.164.44:5060 "Noisy feedback tells:  pid=11082 req_src_ip=203.24.54.17 req_src_port=1350 in_uri=sip:610089001 at 202.74.164.72 out_uri=sip:610089001 at 202.74.164.72 via_cnt==1"
>
> No.     Time        Source                Destination           Protocol Info
>   30359 15.913057   203.24.54.17          202.74.164.44         ICMP     Destination unreachable (Port unreachable)
>
> Frame 30359 (590 bytes on wire, 590 bytes captured)
> Ethernet II, Src: 00:0a:f3:b8:0c:08, Dst: 00:07:e9:11:47:25
> Internet Protocol, Src Addr: 203.24.54.17 (203.24.54.17), Dst Addr: 202.74.164.44 (202.74.164.44)
> Internet Control Message Protocol
>
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