[asterisk-users] NAT solutions

[Tim Panton]

On 26 Jan 2007, at 06:19, Yuan LIU wrote:

>> From: Brad Templeton <brad+aster at templetons.com>
>> > 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?
>>
>> When you control both ends of the path, you can eliminate all NAT
>> problems.  Skype also deals almost perfectly with NAT (by using
>> other nodes as relays if necessary) as does IAX.   SIP was designed
>
> Thanks for this information.  Does this mean two IAX boxes can talk  
> behind their respective NAT's (without any server sitting in voice  
> path)?  I'm imagining this:
>
> Asterisk1 <--> NAT1 --- { Internet } --- NAT2 <--> Asterisk2
>
> If Asterisk1 can talk to Asterisk2 at trunk level, I'll be happy.

Yes, with 1 proviso - one end needs a known IP address and a port map
for udp 4569 in the router. The other can simply register to it with  
zero
router config.


Tim Panton

www.mexuar.net
www.westhawk.co.uk/