asterisk users - Sep 2005 - Two devices behind nat

Hello Everyone,

I have one machine (asterisk server) that is DMZ behind my nat firewall

on my client end (at home) i have a linksys wrt54g with 16384->32766
forwarded to my cisco 7960 (which works fine) and 16000 -> 16383 forwarded
to my sipura 2100 (which is set to these ports)

For some reason, the sipura only works some of the time.

Both devices are set to register, is there anything else I need to do to get
them to work behind nat?

Thanks!

Chris