[OpenSIPS-Users] OpenSIPS 1.7.0 Topology Hiding and NAT Traversal

[Bogdan-Andrei Iancu]

Hi Jeremy,

Indeed, seems to be an incompatibility here...What I would suggest is a 
bit of a trick, to manually handle the NATed contact in a dialog 
variable...Haven;t tried it, just an idea.

On initial INVITE :

modparam("nathelper", "received_avp", "$avp(contact)")
...
topology_hiding();
if (nat_uac_test()) {
	fix_nated_register(); # puts the fix contact into received avp
	$dlg_val(caller_contact) = $avp(contact);
}
...


And for sequential requests:
...
loose_route();
...
if ( match_dialog() ) {
     # sequential request from callee to caller?
     if ($DLG_dir=="UPSTREAM") $ru = $dlg_val(caller_contact) ;
}


Again, not tested, not sure it will work, but just an idea :)

Regards,
Bogdan

On 09/13/2011 07:30 PM, Jeremy Childs wrote:
> I'm having a problem with the dialog module's topology hiding when a 
> UA is behind a NAT.
>
> If I call
>
> if (nat_uac_test()) {
>     fix_nated_contact();
> }
> topology_hiding();
>
> The Contact header is rewritten twice - once by fix_nated_contact() 
> and again by topology_hiding(). This results in an invalid contact header.
>
> Is there an obvious way I'm missing that could make these two modules 
> coexist, or is the best solution to add NAT knowledge to 
> dlg_tophiding.c? This seems like a lot of code to duplicate.
>
>
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-- 
Bogdan-Andrei Iancu
OpenSIPS eBootcamp - 19th of September 2011
OpenSIPS solutions and "know-how"

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