The asterisk side has to have the router ports 5060 and 10000-20000 forwarded 
to asterisk  these are the standard ports but you could cut way down on the rtp 
 ports in rtp.conf then you have to tell asterisk what's the external ip of 
your nat and most of the times this should work today no problem lots of us 
here have it working that way (of course you have to take care of security 
fail2ban etc )
On the phone side you might have to use stun but it depends on the firewall 
also you should set the phone to send a nat keep alive each 30 seconds 
(asterisk also sends a options packet to keep the nat open but doesn't always 
work ok )

-----Original Message-----
From: Danny Dias <[email protected]>
Sender: [email protected]
Date: Fri, 27 Apr 2012 10:22:38 
To: Asterisk Users Mailing List - Non-Commercial 
Discussion<[email protected]>
Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
        <[email protected]>
Subject: Re: [asterisk-users] Asterisk + Phones behind different Nat
        Firewalls

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