[Serusers] Who is violating SIP protocol here, SER or voice-ISP?

Thu Oct 7 18:54:21 CEST 2004

I will attach a full SIP conversation to this e-mail, but here is the
summary of what seems to be happening.

I place a call from my phone here, behind NAT. This contacts a SER
server with nathelper/rtpproxy out on the 'net, which then forwards
the requests to Masergy (www.masergy.com), who provide us with LD VoIP
service. Everything proceeds fine until the "OK" reply from Masergy
signalling the call has been answered. Here's the transaction there:

   Masergy port 29436 -> SER port 5060 "OK"
   SER port 5060 -> My Phone port 5060 "OK"
   My Phone port 5060 -> SER port 5060 "ACK"
   SER port 5060 -> Masergy port 29436 "ACK"

Masergy never receives that last packet.

However, my phone receives all of the information it needs to establish
the RTP connection. It does so, and the call appears to be working fine.
Meanwhile, Masergy's SIP server continues to resend "SIP/2.0 200 OK"
messages (still from port 29436) every few seconds, waiting for a reply.
After ~35 seconds of not hearing back, it assumes the worst and sends a
"BYE", tearing down a call that was going swell, as far as the two
humans involved were concerned.

I've spoken with the relevant tech at Masergy, and their determination
is that our SIP proxy should be sending all SIP traffic to port 5060, 
regardless of what they may be transmitting from.

I just built the very latest CVS version of SER (0.8.99-dev8), and am
seeing the same behavior. Is this a protocol violation on either side?
(Transmitting to a non-5060 port, or not listening for a reply on a
port that was just transmitted from). Is there a way to force SER to
always use 5060? (Which itself probably breaks protocol for some
cases, which we aren't currently dealing with).

Thank you for any info.

Jeremy

-- 
Jeremy M. Dolan <mailto:jmd at pobox.com> <http://jmd.us/>
PGP: 1024D/3C68A1BA 9470 210C A476 FFBB 6D11  0223 0D1C ABFC 3C68 A1BA
-------------- next part --------------
This trace was created with ngrep:
   ./ngrep -W byline -t -v 'Unauthorized|REGISTER' port 5060 > output

Phone numbers and IP addresses have been changed to protect the guilty:
   192.168.0.10 = my phone's IP (1918 address)
   1.1.1.1 = my firewall's IP (where SER would see my traffic coming from)
   2.2.2.2 = SER server's IP
   8.8.8.8 = Masergy's SIP signalling server
   9.9.9.9 = (one of) Masergy's RTP media servers (seen only in SDP packets)
   4445555555 = SIP phone's phone number
   6667777777 = PSTN phone number being called

interface: eth0 (2.2.2.0/255.255.255.128)
filter: ip and ( port 5060 )
don't match: Unauthorized|REGISTER
#############
U 2004/10/07 10:42:31.500815 1.1.1.1:5060 -> 2.2.2.2:5060
INVITE sip:6667777777 at 2.2.2.2;user=phone SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK4057b0b1.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:20 GMT.
CSeq: 101 INVITE.
User-Agent: CSCO/6.
Contact: <sip:4445555555 at 192.168.0.10:5060>.
Expires: 180.
Content-Type: application/sdp.
Content-Length: 249.
Accept: application/sdp.
.
v=0.
o=Cisco-SIPUA 27241 24599 IN IP4 192.168.0.10.
s=SIP Call.
c=IN IP4 192.168.0.10.
t=0 0.
m=audio 25432 RTP/AVP 0 8 18 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:18 G729/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.

#
U 2004/10/07 10:42:31.510470 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK4057b0b1;rport=5060;received=1.1.1.1.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Server: Sip EXpress router (0.8.99-dev8 (i386/linux)).
Content-Length: 0.
Warning: 392 2.2.2.2:5060 "Noisy feedback tells:  pid=12364 req_src_ip=1.1.1.1 req_src_port=5060 in_uri=sip:6667777777 at 64.47.100.23;user=phone out_uri=sip:17732719830 at 8.8.8.8:5060;user=phone via_cnt==1".
.

#
U 2004/10/07 10:42:31.510621 2.2.2.2:5060 -> 8.8.8.8:5060
INVITE sip:16667777777 at 8.8.8.8:5060;user=phone SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:20 GMT.
CSeq: 101 INVITE.
User-Agent: CSCO/6.
Contact: <sip:4445555555 at 1.1.1.1:5060>.
Expires: 180.
Content-Type: application/sdp.
Content-Length: 266.
Accept: application/sdp.
.
v=0.
o=Cisco-SIPUA 27241 24599 IN IP4 192.168.0.10.
s=SIP Call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35018 RTP/AVP 0 8 18 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:18 G729/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:31.568787 8.8.8.8:29430 -> 2.2.2.2:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Content-Length: 0.
.

#
U 2004/10/07 10:42:31.687397 2.2.2.2:5060 -> 1.1.1.1:5060
....
#
U 2004/10/07 10:42:31.835105 8.8.8.8:29430 -> 2.2.2.2:5060
SIP/2.0 183 Session Progress.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:31.835856 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 183 Session Progress.
To: <sip:6667777777 at 2.2.2.2;user=phone>.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29430.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:36.335312 8.8.8.8:29436 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:36.336250 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29436.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:36.518975 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:36.520741 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#
U 2004/10/07 10:42:36.840296 8.8.8.8:29436 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:36.841030 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29436.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:36.933976 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:36.934396 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#
U 2004/10/07 10:42:37.840199 8.8.8.8:29436 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:37.840989 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29436.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:37.933918 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:37.934311 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#################
U 2004/10/07 10:42:39.850082 8.8.8.8:29438 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:39.850789 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29438.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:39.938775 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:39.939154 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#####
U 2004/10/07 10:42:41.787396 2.2.2.2:5060 -> 1.1.1.1:5060
....
#####
U 2004/10/07 10:42:43.850035 8.8.8.8:29440 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:43.850934 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29440.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:43.948604 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:43.949012 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#########
U 2004/10/07 10:42:47.859666 8.8.8.8:29442 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:47.860529 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29442.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:47.953324 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:47.953722 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#
U 2004/10/07 10:42:51.869469 8.8.8.8:29444 -> 2.2.2.2:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKc4b2.5492f2f6.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 157.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 9.9.9.9.
t=0 0.
m=audio 6376 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.

#
U 2004/10/07 10:42:51.870300 2.2.2.2:5060 -> 1.1.1.1:5060
SIP/2.0 200 OK.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 101 INVITE.
Contact: sip:16667777777 at 8.8.8.8:29444.
Content-Type: application/sdp.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK4057b0b1.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Content-Length: 178.
.
v=0.
o=esv1.dfwi.masergy.net 1234 16934 IN IP4 9.9.9.9.
s=sip call.
c=IN IP4 2.2.2.2.
t=0 0.
m=audio 35020 RTP/AVP 0.
a=rtpmap:0 PCMU/8000.
a=sendrecv.
a=nortpproxy:yes.

#
U 2004/10/07 10:42:51.887443 2.2.2.2:5060 -> 1.1.1.1:5060
....
#
U 2004/10/07 10:42:51.964233 1.1.1.1:5060 -> 2.2.2.2:5060
ACK sip:2.2.2.2:5060;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.10:5060;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Route: <sip:16667777777 at 8.8.8.8:29436>.
Content-Length: 0.
.

#
U 2004/10/07 10:42:51.964630 2.2.2.2:5060 -> 8.8.8.8:29436
ACK sip:16667777777 at 8.8.8.8:29436 SIP/2.0.
Max-Forwards: 10.
Record-Route: <sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on>.
Via: SIP/2.0/UDP 2.2.2.2;branch=0.
Via: SIP/2.0/UDP 192.168.0.10:5060;rport=5060;received=1.1.1.1;branch=z9hG4bK3d28987e.
From: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
To: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:46:25 GMT.
CSeq: 101 ACK.
User-Agent: CSCO/6.
Content-Length: 0.
.

#
U 2004/10/07 10:43:01.987391 2.2.2.2:5060 -> 1.1.1.1:5060
....
#####################
U 2004/10/07 10:43:11.832964 8.8.8.8:29451 -> 2.2.2.2:5060
BYE sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Max-Forwards: 68.
Route: <sip:4445555555 at 1.1.1.1:5060>.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 2 BYE.
Via: SIP/2.0/UDP 8.8.8.8:5060.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Length: 0.
.

#
U 2004/10/07 10:43:11.833608 2.2.2.2:5060 -> 1.1.1.1:5060
BYE sip:4445555555 at 1.1.1.1:5060 SIP/2.0.
Record-Route: <sip:2.2.2.2;ftag=3306152785-310961;lr=on>.
Max-Forwards: 16.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 2 BYE.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKdac.d168c652.0.
Via: SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
Contact: sip:16667777777 at 8.8.8.8:29451.
Content-Length: 0.
.

#
U 2004/10/07 10:43:11.957265 1.1.1.1:5060 -> 2.2.2.2:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 2.2.2.2;branch=z9hG4bKdac.d168c652.0,SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:47:00 GMT.
CSeq: 2 BYE.
Server: CSCO/6.
Content-Length: 0.
RTP-RxStat: Dur=40,Pkt=1986,Oct=317760,LatePkt=0,LostPkt=0,AvgJit=0.
RTP-TxStat: Dur=40,Pkt=1992,Oct=318720.
.

#
U 2004/10/07 10:43:11.957523 2.2.2.2:5060 -> 8.8.8.8:29451
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:47:00 GMT.
CSeq: 2 BYE.
Server: CSCO/6.
Content-Length: 0.
RTP-RxStat: Dur=40,Pkt=1986,Oct=317760,LatePkt=0,LostPkt=0,AvgJit=0.
RTP-TxStat: Dur=40,Pkt=1992,Oct=318720.
.

#
U 2004/10/07 10:43:12.087422 2.2.2.2:5060 -> 1.1.1.1:5060
....
#
U 2004/10/07 10:43:12.336993 8.8.8.8:29451 -> 2.2.2.2:5060
BYE sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Max-Forwards: 68.
Route: <sip:4445555555 at 1.1.1.1:5060>.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 2 BYE.
Via: SIP/2.0/UDP 8.8.8.8:5060.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Length: 0.
.

#
U 2004/10/07 10:43:12.337450 2.2.2.2:5060 -> 8.8.8.8:29451
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:47:00 GMT.
CSeq: 2 BYE.
Server: CSCO/6.
Content-Length: 0.
RTP-RxStat: Dur=40,Pkt=1986,Oct=317760,LatePkt=0,LostPkt=0,AvgJit=0.
RTP-TxStat: Dur=40,Pkt=1992,Oct=318720.
.

#
U 2004/10/07 10:43:13.341806 8.8.8.8:29452 -> 2.2.2.2:5060
BYE sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Max-Forwards: 68.
Route: <sip:4445555555 at 1.1.1.1:5060>.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 2 BYE.
Via: SIP/2.0/UDP 8.8.8.8:5060.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Length: 0.
.

#
U 2004/10/07 10:43:13.342319 2.2.2.2:5060 -> 8.8.8.8:29451
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:47:00 GMT.
CSeq: 2 BYE.
Server: CSCO/6.
Content-Length: 0.
RTP-RxStat: Dur=40,Pkt=1986,Oct=317760,LatePkt=0,LostPkt=0,AvgJit=0.
RTP-TxStat: Dur=40,Pkt=1992,Oct=318720.
.

#####
U 2004/10/07 10:43:15.351780 8.8.8.8:29453 -> 2.2.2.2:5060
BYE sip:2.2.2.2;ftag=000f902b48ef00092bde0f52-44bd25ec;lr=on SIP/2.0.
Max-Forwards: 68.
Route: <sip:4445555555 at 1.1.1.1:5060>.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
CSeq: 2 BYE.
Via: SIP/2.0/UDP 8.8.8.8:5060.
Contact: sip:16667777777 at 8.8.8.8:5060.
Content-Length: 0.
.

#
U 2004/10/07 10:43:15.352338 2.2.2.2:5060 -> 8.8.8.8:29451
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 8.8.8.8:5060;rport=29451.
From: <sip:6667777777 at 2.2.2.2;user=phone>;tag=3306152785-310961.
To: "User" <sip:4445555555 at 2.2.2.2>;tag=000f902b48ef00092bde0f52-44bd25ec.
Call-ID: 000f902b-48ef000b-389b653d-796379fe at 192.168.0.10.
Date: Thu, 07 Oct 2004 15:47:00 GMT.
CSeq: 2 BYE.
Server: CSCO/6.
Content-Length: 0.
RTP-RxStat: Dur=40,Pkt=1986,Oct=317760,LatePkt=0,LostPkt=0,AvgJit=0.
RTP-TxStat: Dur=40,Pkt=1992,Oct=318720.
.

########exit
138 received, 0 dropped