13 Sep
2005
13 Sep
'05
10:09 a.m.
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@sip.domain.com SIP/2.0.
Content-Type: application/sdp.
Via: SIP/2.0/UDP a.b.c.d:5060.
To: <sip:0123456789@sip.domain.com>.
From:
<sip:047132@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@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@sip.domain.com>.
From:
<sip:047132@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@sip.domain.com
out_uri=sip:44123456789@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@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@sip.domain.com>.
From:
<sip:047132@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@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@sip.domain.com>.
From:
<sip:047132@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257cfc-1c12c480-4823.
To: <sip:0123456789@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@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@sip.domain.com>;tag=38EED020-1D04.
From:
<sip:047132@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@a.b.c.d:5060>.
Route: <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257cfc-1c12c480-4823;lr=on>.
Route: <sip:0044123456789@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@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@sip.domain.com>;tag=38EED020-1D04.
From:
<sip:047132@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@a.b.c.d:5060>.
Route: <sip:0044123456789@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@sip.domain.com SIP/2.0.
Content-Type: application/sdp.
Via: SIP/2.0/UDP a.b.c.d:5060.
To: <sip:0123456789@sip.domain.com>.
From:
<sip:047132@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@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@sip.domain.com>.
From:
<sip:047132@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@sip.domain.com
out_uri=sip:441560485332@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@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@sip.domain.com>.
From:
<sip:047132@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@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@sip.domain.com>.
From:
<sip:047132@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
To: <sip:0123456789@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@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@a.b.c.d:5060>;tag=c7ec14d4-13c4-43257d73-1c14942f-4823.
To: <sip:0123456789@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@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@sip.domain.com>;tag=38F09FAC-544.
From:
<sip:047132@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@a.b.c.d:5060>.
Route: <sip:y.y.y.y;ftag=c7ec14d4-13c4-43257d73-1c14942f-4823;lr=on>.
Route: <sip:0044123456789@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@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@sip.domain.com>;tag=38F09FAC-544.
From:
<sip:047132@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@a.b.c.d:5060>.
Route: <sip:0044123456789@a.a.a.a:5060>.
Content-Length: 0.
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