[asterisk-users] NAT solutions

[Robert Jenkins]

> -----Original Message-----
> 
> Gordon Henderson
> Sent: 25 January 2007 08:17
> 
> 
> On Wed, 24 Jan 2007, Yuan LIU wrote:
> 
> > I have a really dumb question.  It appears that Yahoo, MSN, AIM, you 
> > name them, they don't have a NAT problem, and some use SIP. I don't 
> > think they all stay in voice path, either.  What takes?
> 
> Their SIP servers aren't behind NAT firewalls, so the problem 
> shifts from them to you ...
> 
> In the UK, there is a good number (100's of thousands? More?) 
> of ADSL customers who also connect their PC directly to the 
> 'net (via free USB adapters that most ISPs supply) so in this 
> situation you could well be using a soft-phone on one PC to 
> talk to another soft-phone on another PC, both directly 
> connected to the net without NAT, using a non NATted SIP 
> server of some kind to setup the call, then data doesn't need 
> to be hairpinned via the SIP server.
> 
> And they are possibly using proprietary clients that know 
> more about NATting than a generic SIP client might, so can 
> use this to avoid NATting issues too...
> 
> Gordon
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The other thing with programs such as MSN Messenger etc. is that many now
support UPNP (I know for a fact MSN Messenger does), and most consumer ADSL
boxes and routers also have UPNP enabled, so the NAT / firewall ports _are_
being opened & redirected, but without any user intervention...

Robert Jenkins.