[OpenSER-Users] ALG error workarounds

Richard Bennett richard.bennett at skynet.be
Fri Oct 26 20:17:31 CEST 2007


On Fri, 26 Oct 2007 18:08:14 +0200, Phil D'Amore <ptdamore at gmail.com>  
wrote:

> Richard:
Hi,

> In the cases where it doesn't work, can you confirm that the Contact
> URI in the 200 actually contains a public address as it leaves your
> network?  What you're describing makes me think it's not, and it looks
> like the following to me:
>
> GW sends 200 with private address in Contact.  This private address
> leaks out of your network.  This private address happens to fall
> within the range of your customer's private network.

It doesn't seem to be that. Both the gateway and the proxy have public IPs  
and no private ones.

> The ALG sees this, and notices the RURI contains a private address
> from it's own local network.  It PATs this address (hence the port
> 2021, it just picks the next port, since 2020 was already used by your
> PAP2T).  The ACK now contains the offending address in the RURI.  When
> your openser instance gets it, it just relays it like it was told to
> do based on loose routing, and the call drops.>
> The thing about those ALGs is that they will rewrite *anything* that
> matches the access list associated with the nat pool address, even if
> it has nothing to do with any real IP traffic flowing through the
> thing.

Ok. Interesting to know how it does that.
In this case it doesn't seem to be that that is triggering the re-write  
though.
I pasted the whole call trace at the end of this email, in case anyone  
sees anything suspicious.

Thanks for thinking this through with me, and for any tips on how I could  
detect and re-write these errors.

Richard.

Trace:

1.2.3.201  = Openser proxy
1.2.3.204 = Cisco gateway
81.1.2.218 = User agent IP.


U 81.1.2.218:2020 -> 1.2.3.201:5060
INVITE sip:00243999049102 at sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-21460b8b.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 101 INVITE.
Max-Forwards: 70.
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
Expires: 240.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 252.
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER.
Supported: x-sipura.
Content-Type: application/sdp.
.
v=0.
o=- 18539 18539 IN IP4 192.168.1.6.
s=-.
c=IN IP4 81.1.2.218.
t=0 0.
m=audio 16468 RTP/AVP 4 100 101.
a=rtpmap:4 G723/8000.
a=rtpmap:100 NSE/8000.
a=fmtp:100 192-193.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=sendrecv.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 407 Proxy Authentication Required.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-21460b8b.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To:  
<sip:00243999049102 at sip.example.com>;tag=9df88149756df0cbffcc8c4447862715.8d93.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 101 INVITE.
Proxy-Authenticate: Digest realm="sip.example.com",  
nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4".
Server: OpenSer (1.1.0-notls (i386/linux)).
Content-Length: 0.
Warning: 392 1.2.3.201:5060 "Noisy feedback tells:  pid=15647  
req_src_ip=81.1.2.218 req_src_port=2020  
in_uri=sip:00243999049102 at sip.example.com  
out_uri=sip:00243999049102 at sip.example.com via_cnt==1".
.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:00243999049102 at sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-21460b8b.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To:  
<sip:00243999049102 at sip.example.com>;tag=9df88149756df0cbffcc8c4447862715.8d93.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 101 ACK.
Max-Forwards: 70.
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 81.1.2.218:2020 -> 1.2.3.201:5060
INVITE sip:00243999049102 at sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 INVITE.
Max-Forwards: 70.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:00243999049102 at sip.example.com",algorithm=MD5,response="e038a957ab555bc5a6734800164115b6".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
Expires: 240.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 252.
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER.
Supported: x-sipura.
Content-Type: application/sdp.
.
v=0.
o=- 18539 18539 IN IP4 192.168.1.6.
s=-.
c=IN IP4 81.1.2.218.
t=0 0.
m=audio 16468 RTP/AVP 4 100 101.
a=rtpmap:4 G723/8000.
a=rtpmap:100 NSE/8000.
a=fmtp:100 192-193.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=sendrecv.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 INVITE.
Server: OpenSer (1.1.0-notls (i386/linux)).
Content-Length: 0.
Warning: 392 1.2.3.201:5060 "Noisy feedback tells:  pid=15676  
req_src_ip=81.1.2.218 req_src_port=2020  
in_uri=sip:00243999049102 at sip.example.com  
out_uri=sip:202000243999049102 at 1.2.3.204 via_cnt==1".
.


U 1.2.3.201:5060 -> 1.2.3.204:5060
INVITE sip:202000243999049102 at 1.2.3.204 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 INVITE.
Max-Forwards: 69.
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
Expires: 240.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 252.
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER.
Supported: x-sipura.
Content-Type: application/sdp.
.
v=0.
o=- 18539 18539 IN IP4 192.168.1.6.
s=-.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 100 101.
a=rtpmap:4 G723/8000.
a=rtpmap:100 NSE/8000.
a=fmtp:100 192-193.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=sendrecv.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow-Events: telephone-event.
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Disposition: session;handling=required.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.0,SIP/2.0/UDP  
81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.204.
t=0 0.
m=audio 17204 RTP/AVP 4 101.
c=IN IP4 1.2.3.204.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 1.2.3.201:5060 -> 81.1.2.218:2020
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
Server: Cisco-SIPGateway/IOS-12.x.
CSeq: 102 INVITE.
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, REFER, SUBSCRIBE,  
NOTIFY, INFO, UPDATE, REGISTER.
Allow-Events: telephone-event.
Contact: <sip:202000243999049102 at 1.2.3.204:5060>.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Content-Type: application/sdp.
Content-Length: 294.
.
v=0.
o=CiscoSystemsSIP-GW-UserAgent 1869 2060 IN IP4 1.2.3.204.
s=SIP Call.
c=IN IP4 1.2.3.201.
t=0 0.
m=audio 61504 RTP/AVP 4 101.
c=IN IP4 1.2.3.201.
a=rtpmap:4 G723/8000.
a=fmtp:4 annexa=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:30.
a=direction:passive.


U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2021
ACK sip:202000243999049102 at 81.1.2.218:2021 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bKf233.b0309086.2.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-a8d9ae6f.
From: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102 at 81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000 at 81.1.2.218:2020>.
User-Agent: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.204:51431 -> 1.2.3.201:5060
BYE sip:101000000 at 81.1.2.218:2020 SIP/2.0.
Via: SIP/2.0/UDP  1.2.3.204:5060;branch=z9hG4bKD3B675E.
From: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
To: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
User-Agent: Cisco-SIPGateway/IOS-12.x.
Max-Forwards: 70.
Route: <sip:1.2.3.201;lr=on;ftag=32750c901739579ao0>.
Timestamp: 1193399881.
CSeq: 101 BYE.
Content-Length: 0.
.


U 1.2.3.201:5060 -> 81.1.2.218:2020
BYE sip:101000000 at 81.1.2.218:2020 SIP/2.0.
Record-Route: <sip:1.2.3.201;lr=on;ftag=F48836B0-608>.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bK2333.35ada747.0.
Via: SIP/2.0/UDP  1.2.3.204:5060;branch=z9hG4bKD3B675E.
From: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
To: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
User-Agent: Cisco-SIPGateway/IOS-12.x.
Max-Forwards: 69.
Timestamp: 1193399881.
CSeq: 101 BYE.
Content-Length: 0.
.


U 81.1.2.218:2020 -> 1.2.3.201:5060
SIP/2.0 200 OK.
To: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
From: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 101 BYE.
Via: SIP/2.0/UDP 1.2.3.201;branch=z9hG4bK2333.35ada747.0.
Via: SIP/2.0/UDP 1.2.3.204:5060;branch=z9hG4bKD3B675E.
Record-Route: <sip:1.2.3.201;lr=on;ftag=F48836B0-608>.
Timestamp: 1193399881.
Server: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.
.


U 1.2.3.201:5060 -> 1.2.3.204:5060
SIP/2.0 200 OK.
To: %5 <sip:101000000 at sip.example.com>;tag=32750c901739579ao0.
From: <sip:00243999049102 at sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742 at 192.168.1.6.
CSeq: 101 BYE.
Via: SIP/2.0/UDP 1.2.3.204:5060;branch=z9hG4bKD3B675E.
Record-Route: <sip:1.2.3.201;lr=on;ftag=F48836B0-608>.
Timestamp: 1193399881.
Server: Linksys/PAP2T-3.1.15(LS).
Content-Length: 0.






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