Multiple Fax Caller ID

Hi,

How to setup fax Pro module so that different users have access to it but at a different caller id. I do understand I can put dial prefix (ex: 9) to choose a specific route, but that is one prefix only.

In my case I have 4 groups of users and each want to send the fax from a specific caller ID… how to do that?

I though of adding 4 different prefix to route calls to different outbound routes, but this will require the user to add this prefix manually before the called number, is there any thing i can do so it will choose the route according to user group?

Kind Regards