asterisk users - May 2005 - How Two Asterisk Boxes Behind A Nat Initiate Calls

Hi:

Is it possible for two asterisk boxes behind a nat to
initiate iax call over the internet?
I can understand the case when one has a public ip and
one behind a nat. In such a case, the nat asterisk
would register with the public ip asterisk and IAX
channel is always open to initiate a call. But in the
two nat cases, how would they know where the other is
and subsequently initiate a call?
I appreciate your opinions or any referrences?


		
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