Re: [OpenSER-Users] ALG error workarounds

26 Oct 2007

On Fri, 26 Oct 2007 18:08:14 +0200, Phil D'Amore &lt;ptdamore(a)gmail.com&gt;  
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@sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-21460b8b.
From: %5 <sip:101000000@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 101 INVITE.
Max-Forwards: 70.
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To:  
<sip:00243999049102@sip.example.com>;tag=9df88149756df0cbffcc8c4447862715.8d93.
Call-ID: da59b048-d5ba4742(a)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@sip.example.com  
out_uri=sip:00243999049102@sip.example.com via_cnt==1".
.

U 81.1.2.218:2020 -> 1.2.3.201:5060
ACK sip:00243999049102@sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-21460b8b.
From: %5 <sip:101000000@sip.example.com>;tag=32750c901739579ao0.
To:  
<sip:00243999049102@sip.example.com>;tag=9df88149756df0cbffcc8c4447862715.8d93.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 101 ACK.
Max-Forwards: 70.
Contact: %5 <sip:101000000@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@sip.example.com SIP/2.0.
Via: SIP/2.0/UDP 81.1.2.218:2020;branch=z9hG4bK-13d1535f.
From: %5 <sip:101000000@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 INVITE.
Max-Forwards: 70.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:00243999049102@sip.example.com",algorithm=MD5,response="e038a957ab555bc5a6734800164115b6".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>.
Call-ID: da59b048-d5ba4742(a)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@sip.example.com  
out_uri=sip:202000243999049102@1.2.3.204 via_cnt==1".
.

U 1.2.3.201:5060 -> 1.2.3.204:5060
INVITE sip:202000243999049102@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 INVITE.
Max-Forwards: 69.
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@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@sip.example.com>;tag=32750c901739579ao0.
To: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)192.168.1.6.
CSeq: 102 ACK.
Max-Forwards: 69.
Proxy-Authorization: Digest  
username="101000000",realm="sip.example.com",nonce="4721d74d797d2fcdae92fc29db4798914ddb90a4",uri="sip:202000243999049102@81.1.2.218:2021",algorithm=MD5,response="d0a6ac0edaabb7fca6ef3ff448c7c4e1".
Contact: %5 <sip:101000000@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@81.1.2.218:2020 SIP/2.0.
Via: SIP/2.0/UDP  1.2.3.204:5060;branch=z9hG4bKD3B675E.
From: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
To: %5 <sip:101000000@sip.example.com>;tag=32750c901739579ao0.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@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@sip.example.com>;tag=F48836B0-608.
To: %5 <sip:101000000@sip.example.com>;tag=32750c901739579ao0.
Date: Fri, 26 Oct 2007 11:57:22 GMT.
Call-ID: da59b048-d5ba4742(a)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@sip.example.com>;tag=32750c901739579ao0.
From: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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@sip.example.com>;tag=32750c901739579ao0.
From: <sip:00243999049102@sip.example.com>;tag=F48836B0-608.
Call-ID: da59b048-d5ba4742(a)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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Re: [OpenSER-Users] ALG error workarounds