[sr-dev] why new tcp connection?

[Iñaki Baz Castillo]

El Viernes, 6 de Noviembre de 2009, Klaus Darilion escribió:
> Juha Heinanen schrieb:
> > Klaus Darilion writes:
> >  > 2. server
> >  > I use the pragmatic, and well working UDP approach. Just call
> >  > fix_nated_contact/register also for TCP clients. I never had any
> >  > issues with that.
> >
> > even when client is not behind nat like in the example of the
> > discussion?
> 
> In this case it can work also with client receiving responses/in-dialog
> requests at advertised port

> (as long as the client is really listening on the advertised port).

It should!



> But one of my favorites statement is: "Never trust the user". As the
> contact and Via headers are user provided data I do not trust it. Thus I
> always enforce symmetric signaling, regardless if client is behind NAT
> or not and regardless of the used protocol.*

Some SIP ALG routers change the Via/Contact port and set 12345 while the 
public source port is 12344. Really. So don't believe the user, neither the 
routers! XD




-- 
Iñaki Baz Castillo <ibc at aliax.net>