Everything is working fine allready.
The only problem we have is that IAX2 on asterisk 1.4.22/rc5 does have a very poor sound quality ( sounds like a robot ).
We have no idea what to do. We googled - tryed every known config.
one example of iax.conf we use:
autokill = 3500
delayreject = yes
at the moment we use SIP and ISDN - but IAX has lower troubles with nat - and we even have not stun server … so external connections with sip isnt working good. Thats why we want to use IAX.