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

Iqbal iqbal at gigo.co.uk
Mon Sep 12 21:51:58 CEST 2005 

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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