[Asterisk-Users] Caller ID

[Pepe Grillo]

Hello !

I'm  really new to asterisk, in fact I have been 
only using it  as a simple PBX, now a customer 
mine needs to show a different "call back number" 
or a different Caller ID, because they have the
customers service in another country ....and
they use my asterisk server for outgoing
calls only through an IAX provider ...

There is a way to do that ?

Any lights ?, any links ? ... can somebody
point me to the right direction ?

Thanks in advance !

Pepe