[asterisk-users] IAX best practices

[Asterisk]

Hi guys,

I am planning to connect two Asterisk boxes that are currently running
in two different countries, using IAX.

I was wondering if anyone could provide me with some links or suggestion
regarding best practices in connecting two Asterisk in such way. I guess
many of you have already tried this, and already have some know-how
(what I should be careful about, what to avoid, etc...)?

Regards,
Alex