Asterisk configuration problem : IAX

Hi, I am using asterisk@home (i know, it’s not the same configuration than a normal asterisk but I think my problem doesn’t come from there).

So, I configured my asterisk and my client with IAX. When I try to make a call in my local network it works… I can call and / or give a message. But when I want to do an outgoing call it doesn’t work.

Anybody said me that I schould mount a STUN… but I’ve heard too that the STUN was for the SIP. So a IAX schould not need it…

Now, I don’t know really what I schould do nor from where does my problem come.

Can anybody help me?