[Serusers] one way voice on public IP...ngrep

Tue Sep 13 10:09:08 CEST 2005

Try to rtp proxy the call. Then you will know if it's a firewall problem (if 
the proxying doesn't get through either).
Try to connect to the open UA port while the call is in progress (using a 
network scanner like nmap). Then you know if the UA is really listening and 
available.
Set up a hub in front of the UA and listen to the media stream. Does it go 
to the correct port? (if the UA is asymmetric and Cisco GW is default in 
passive mode, it will disregard the port info in SDP and wait until 
contacted by the UA and return the media stream to the port sending RTP to 
it)

Just my 2 cents...
g-)

Iqbal wrote:
> Hi
>
> All the IP adds here are public, but I get one way voice, i.e from UA
> to pstn I can get voice, but not from pstn to UA box
>
> UA ---SER---PSTN
>
>
> a.b.c.d - UA
> x.x.x.x = SER
> y.y.y.y = pstn gw
> a.a.a.a = pstn gw 2
>
> The c= and all seem correct, and natting problems shouldn't come into
> this...all ports are open, there is a FW, but that doesnt show
> anything, any thoughts on howto debug this
>
> Iqbal
> --------
>
>
>
>
> U 2005/09/12 14:20:26.349238 a.b.c.d:5060 -> x.x.x.x:5060
> INVITE sip:0123456789 at sip.domain.com SIP/2.0.
> Content-Type: application/sdp.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Content-Length: 241.
> .
> v=0.
> o=voxeo 0 0 IN IP4 a.b.c.d.
> s=voxeo.
> t=0 0.
> m=audio 10198 RTP/AVP 0 121 101.
> c=IN IP4 a.b.c.d.
> a=rtpmap:121 frf-dialed-digit/8000.
> a=fmtp:121 0-15.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-15.
> a=rtpmap:0 PCMU/8000.
>
> ##
> U 2005/09/12 14:20:26.393835 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 100 trying -- your call is important to us.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Content-Length: 0.
> Warning: 392 x.x.x.x:5060 "Noisy feedback tells:  pid=31505
> req_src_ip=a.b.c.d req_src_port=5060
> in_uri=sip:0123456789 at sip.domain.com
> out_uri=sip:44123456789 at y.y.y.y:5060 via_cnt==1".
> .
>
> #
> U 2005/09/12 14:20:26.394104 x.x.x.x:5060 -> y.y.y.y:5060
> INVITE sip:44123456789 at y.y.y.y:5060 SIP/2.0.
> Max-Forwards: 10.
> Record-Route:
> <sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Content-Type: application/sdp. Via: SIP/2.0/UDP 
> x.x.x.x;branch=z9hG4bKc628.0cf5ca27.0.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Content-Length: 241.
> .
> v=0.
> o=voxeo 0 0 IN IP4 a.b.c.d.
> s=voxeo.
> t=0 0.
> m=audio 10198 RTP/AVP 0 121 101.
> c=IN IP4 a.b.c.d.
> a=rtpmap:121 frf-dialed-digit/8000.
> a=fmtp:121 0-15.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-15.
> a=rtpmap:0 PCMU/8000.
>
> ##
> U 2005/09/12 14:20:26.401238 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 100 trying -- your call is important to us.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bKc628.0cf5ca27.0.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Server: Sip EXpress router (0.8.99-dev (i386/linux)).
> Content-Length: 0.
> .
>
> ######
> U 2005/09/12 14:20:30.161123 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bKc628.0cf5ca27.0,SIP/2.0/UDP
> a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04. Date: Mon, 12 Sep 
> 2005 13:04:45 gmt.
> Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 5590 7529 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 17896 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:20:30.163775 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04. Date: Mon, 12 Sep 
> 2005 13:04:45 gmt.
> Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 5590 7529 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 17896 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> ##
> U 2005/09/12 14:20:31.368083 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bKc628.0cf5ca27.0,SIP/2.0/UDP
> a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04. Date: Mon, 12 Sep 
> 2005 13:04:45 gmt.
> Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER,
> SUBSCRIBE, NOTIFY, INFO.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 5590 7529 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 17896 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:20:31.370673 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04. Date: Mon, 12 Sep 
> 2005 13:04:45 gmt.
> Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER,
> SUBSCRIBE, NOTIFY, INFO.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 5590 7529 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 17896 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:20:31.392583 a.b.c.d:5060 -> x.x.x.x:5060
> ACK sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on
> SIP/2.0. Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 ACK. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Route: <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
> Route: <sip:0044123456789 at a.a.a.a:5060>.
> Content-Length: 0.
> .
>
> #
> U 2005/09/12 14:20:31.394335 x.x.x.x:5060 -> y.y.y.y:5060
> ACK sip:0044123456789 at a.a.a.a:5060 SIP/2.0.
> Max-Forwards: 10.
> Record-Route:
> <sip:x.x.x.x;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>. Via:
> SIP/2.0/UDP x.x.x.x;branch=0. Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>;tag=38EED020-1D04.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
> CSeq: 1 ACK. Call-ID: c7ec14d4-13c4-43257cfc-1c12c480-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Route: <sip:0044123456789 at a.a.a.a:5060>.
> Content-Length: 0.
> .
>
> ###############################################################################################################################################################################################################################################################################################################################
> U 2005/09/12 14:22:25.033315 a.b.c.d:5060 -> x.x.x.x:5060
> INVITE sip:0123456789 at sip.domain.com SIP/2.0.
> Content-Type: application/sdp.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Content-Length: 241.
> .
> v=0.
> o=voxeo 0 0 IN IP4 a.b.c.d.
> s=voxeo.
> t=0 0.
> m=audio 10198 RTP/AVP 0 121 101.
> c=IN IP4 a.b.c.d.
> a=rtpmap:121 frf-dialed-digit/8000.
> a=fmtp:121 0-15.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-15.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:25.067537 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 100 trying -- your call is important to us.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Content-Length: 0.
> Warning: 392 x.x.x.x:5060 "Noisy feedback tells:  pid=31508
> req_src_ip=a.b.c.d req_src_port=5060
> in_uri=sip:0123456789 at sip.domain.com
> out_uri=sip:441560485332 at y.y.y.y:5060 via_cnt==1".
> .
>
> #
> U 2005/09/12 14:22:25.068063 x.x.x.x:5060 -> y.y.y.y:5060
> INVITE sip:441560485332 at y.y.y.y:5060 SIP/2.0.
> Max-Forwards: 10.
> Record-Route:
> <sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Content-Type: application/sdp. Via: SIP/2.0/UDP 
> x.x.x.x;branch=z9hG4bK7719.a95a2e74.0.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Content-Length: 241.
> .
> v=0.
> o=voxeo 0 0 IN IP4 a.b.c.d.
> s=voxeo.
> t=0 0.
> m=audio 10198 RTP/AVP 0 121 101.
> c=IN IP4 a.b.c.d.
> a=rtpmap:121 frf-dialed-digit/8000.
> a=fmtp:121 0-15.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-15.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:25.078167 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 100 trying -- your call is important to us.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bK7719.a95a2e74.0.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 INVITE. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Server: Sip EXpress router (0.8.99-dev (i386/linux)).
> Content-Length: 0.
> .
>
> ############
> U 2005/09/12 14:22:28.963663 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bK7719.a95a2e74.0,SIP/2.0/UDP
> a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544. Date: Mon, 12 Sep 
> 2005 13:06:43 gmt.
> Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 3344 8781 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 16636 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:28.966645 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544. Date: Mon, 12 Sep 
> 2005 13:06:43 gmt.
> Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Content-Disposition: session;handling=required.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 3344 8781 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 16636 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:30.228227 y.y.y.y:5060 -> x.x.x.x:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP x.x.x.x;branch=z9hG4bK7719.a95a2e74.0,SIP/2.0/UDP
> a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544. Date: Mon, 12 Sep 
> 2005 13:06:43 gmt.
> Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER,
> SUBSCRIBE, NOTIFY, INFO.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 3344 8781 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 16636 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:30.230960 x.x.x.x:5060 -> a.b.c.d:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP a.b.c.d:5060.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544. Date: Mon, 12 Sep 
> 2005 13:06:43 gmt.
> Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Server: Cisco-SIPGateway/IOS-12.x.
> CSeq: 1 INVITE.
> Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER,
> SUBSCRIBE, NOTIFY, INFO.
> Allow-Events: telephone-event.
> Contact: <sip:0044123456789 at a.a.a.a:5060>.
> Record-Route:
> <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>,<sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Content-Type: application/sdp.
> Content-Length: 182.
> .
> v=0.
> o=CiscoSystemsSIP-GW-UserAgent 3344 8781 IN IP4 a.a.a.a.
> s=SIP Call.
> c=IN IP4 a.a.a.a.
> t=0 0.
> m=audio 16636 RTP/AVP 0.
> c=IN IP4 a.a.a.a.
> a=rtpmap:0 PCMU/8000.
>
> #
> U 2005/09/12 14:22:30.253088 a.b.c.d:5060 -> x.x.x.x:5060
> ACK sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on
> SIP/2.0. Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 ACK. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Route: <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
> Route: <sip:0044123456789 at a.a.a.a:5060>.
> Content-Length: 0.
> .
>
> #
> U 2005/09/12 14:22:30.254767 x.x.x.x:5060 -> y.y.y.y:5060
> ACK sip:0044123456789 at a.a.a.a:5060 SIP/2.0.
> Max-Forwards: 10.
> Record-Route:
> <sip:x.x.x.x;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>. Via:
> SIP/2.0/UDP x.x.x.x;branch=0. Via: SIP/2.0/UDP a.b.c.d:5060.
> To: <sip:0123456789 at sip.domain.com>;tag=38F09FAC-544.
> From:
> <sip:047132 at a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
> CSeq: 1 ACK. Call-ID: c7ec14d4-13c4-43257d73-1c14942f-29-15a7ee8.
> Contact: <sip:047132 at a.b.c.d:5060>.
> Route: <sip:0044123456789 at a.a.a.a:5060>.
> Content-Length: 0.
>
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