This is somewhat related to my other query on the list regarding NAT traversal.
I have heard many times that IAX is "NAT-transperant". I am unsure how it accomplishes this.
I do know that SIP works like this: your SIP device send a request to the SIP server (usually on port 5060) with whatever command. The SIP server respends to your device's "apparent" IP and port (this is decided depending on how that NAT is set up, STUN, etc.). The voice is then sent to the "apparent" RTP port on your device (deciding what that is, again, would depend on the NAT set up).
Actually, ASTERISK's NAT support deals with the "apparent IP address", but that's just how Asterisk does it. It's not a standard.
See the following for SIP and NAT: http://voip-itec.tamu.edu/files/reference/voip-nat.pdf http://www.cs.columbia.edu/sip/drafts/Ther0005_SIP.pdf http://www.vonmag.com/issue/2004/julaug/columns/isenberg.htm
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