[Serusers] UA's behind the same NAT

[Greger V. Teigre]

Noel,
If you send the config showing how you do it, it will be easier to comment. 
:-)

In general, what you should do is this:
- Starting from onsip.org configs, there are three locations you need to 
change: route[4] NAT Traversal, loose route handling and onreply
- I suggest creating a new route block where you test the src_ip of the 
message against the looked up location of ruri/domain, i.e. this only works 
after a successful lookup("location") has been done. This should be the 
(untested) code snippet:
avp_write("$ruri/domain", "i:624");
if (avp_check("i:624","eq/$src_ip")) {
  setflag(SAME_NAT);
}
(NOTE: I'm not sure about how avp_write will handle $ruri/domain as :port is 
at the end of the domain for ruri after a lookup. You should probably turn 
on debugging and use avp_print)
- Then run the test from the NAT traversal route, as well as the loose route 
(not in onreply) and check for the flag before doing force_rtp_proxy
- In onreply add && !isflagset(SAME_NAT) to the NAT if test

No guarantees... This has not been tested.  However, if you can report that 
it works (or whatever was wrong), I will submit the code piece as a 
suggestion for the ONsip.org Getting Started document.
g-)


----- Original Message ----- 
From: "Noel Sharpe" <noels at radnetwork.co.uk>
To: "'SER Users'" <serusers at lists.iptel.org>
Sent: Wednesday, November 09, 2005 9:15 PM
Subject: [Serusers] UA's behind the same NAT


> Hi All
>
> I am trying to improve my proxy setup to force clients behind the same NAT 
> device to connect each other directly.  My setup is fairly complex, 
> (rtpproxy / NAT Helper, PSTN gateways,  different peers etc)  but it's 
> loosely based on the OnSip.org setup.
> The current config works correctly for all clients, whether behind a NAT 
> or not, but I'd prefer not to have to use RTP proxy to allow UA's on the 
> same nat to contact each other.  I've seen the document from the AVPops 
> module, but I can't get the example to work.  I think the problem is WHERE 
> I put the avpops config.  As this works on FWD, I think it's possible. 
> Has anyone got this working?
>
> Noel
>
>
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