[asterisk-users] several behind NAT

[Todd- Asterisk]

I've got my asterisk server in the DMZ of my local LAN - I've used my  
Budgetone and GXP2000's from the Internet- on direct IP connections  
with no problems.  However, I'm about to deploy about 5 phones  
(either budgetone or GXP2000's) all on a LAN behind a NAT- on a  
different network than the Asterisk server.  Should I look into using  
STUN servers?  Will this setup be a problem?  I've read about NAT and  
STUN on voip-info but am looking for more information..   btw- I'm  
not set on Grandstream.  If you think Polycom or something can handle  
NAT better, then I'll use that instead.  I guess there's no IAX  
phones yet...  Thanks in advance.
   Todd