[Asterisk-Users] Working Xten, Asterisk, double-NAT configs out there?

[Wilson Pickett]

> I have my * box NAT'd with all ports forwarded that are SIP related
> (based on Wiki).  I also have nat=yes, externalip=WAN address of
> firewall, internalip=LAN network of *.
> 
> I have my Xten soft phone on a PC which is NAT'd behind firewall with
> ports forwarded.  I have also followed instructions on Wiki for Xten.

Take a look here:

http://willypick.mindsay.com/?entry=10

Your problem does not sound like NAT to me, but authentication on the
other end. Max retries refers to the phone you are trying to reach.