[Asterisk-Users] multiple outside phones

[dbakkerlist at arrayasolutions.com]

Is there anyway to have multiple VOIP phones (from inside NAT firewalls 
and not) connect to my single * server? What do I need? I could put my * 
server on the outside of the my firewall but I'd rather not. Does the SIP 
Express server help at all? I can get phones to connect but I dont get any 
voice. I'm assuming it's NATn issues.