[Asterisk-Users] port number keeps changing

[WipeOut]

Matt Lawson wrote:

> We have an asterisk installation that's on a residential-grade DSL and 
> its port number (as visible from the outside) keeps changing, every 
> time it registers.  fuser indicates that asterisk is only using port 
> 4569 for IAX2 (as it should), but when it goes out over the Internet, 
> the port number is reported as something in the 10000's and it changes 
> every time.
>
> Obviously, this is a network issue of some type, but can anyone 
> explain more precisely why this happens and how to stop it?  We have 
> some other installations that stay put on port 4569 like they're 
> supposed to. Network issues aren't my area of expertise.
>
> Thanks.
>
My guess would be NAT..

NAT boxes typically use high port numbers to map the return path for the 
data.. each time your box is registering it is probably being allocated 
another port on the NAT..

Of course I could be wrong.. ;)

Later..