[asterisk-users] Extensions Register but don't ring when called, can call others though

[Tim P]

Not sure where to even start with this.  I am running asterisk 1.2.1 and
freepbx as the frontend. I have a remote user with soft phones (tried 3 all
register and call out)  that registers fine (see it in asterisk and see it
in phone) and can call extensions on the asterisk box with no problem.
Other extensions are UNABLE  to call any extensions at the remote site.  I
have tried 2 different machines as well as trying a vpn connection on one to
the central asterisk box with the same problem.  The remote users isp is not
blocking any ports that i can determine and I have even put the machine with
the softphones on the dmz to test it, same problem everytime.  Asterisk CLI
interface (verbosity 5) shows it being called but it never rings on the
remote users side.

What else should I be looking at?
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