Dunca: I am not sure I understand your statemnet. SIP devices (UA) on the other side of the Internet behnid a NAT communicate to * on the public Internet. Then this Asterisk connects to other Asterisks (via IAX) that can be behind Firwalls (or NATS). am I understanding correctly?
this is possible yes.
or wherever you have a firewall - make sure theres an asterisk server behind each one. then open up IAX or IAX2 through your firewall and let the SIP clients connect "locally" to the asterisk server. remember you can run asterisk on very little processing power and it doesnt need any specific hardware to just do VoIP stuff.
my setups are something like this:
branch office sip phones -> asterisk server -> firewall -> internet
datacenter
internet -> firewall -> asterisk server -> pstn
so i dont have any problems with trying to get SIP working through firewalls - i just put a local asterisk server wherever theres going to be sip phones. because IAX is so flexible with regard to firewalls it doesnt matter if the main asterisk server is on the public internet or behind a firewall with the IAX/2 ports opened up.
duncan
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