[Asterisk-Security] How does native IAX encryption work?

[Brian Capouch]

I have seen plenty of evidence in the -cvs list and various posts in the 
bugtracker that there is now, at least on an experimental basis, support 
for native IAX encryption included in the CVS-HEAD versions.  There's 
even an "encryption" parameter in iax.conf.

I have yet to see any explanation as to how it works--surely there must 
be a key exchange of some sort?

Anyways, I'm hoping someone here knows the scene.

Thanks.

B.