[Freeswitch-users] setting per user variables in dial plan.

Hi, I know this has been discussed before but i'm failing to either understand fundamentals or just tie it together. I'm using originate to submit a tiff to the txfax application. No problem there. In my originate command i'm also setting a custom variable called "realm" which I use to tie an originate command to a customer. So i was trying to match the realm in a dialplan and set a bunch of other variables per realm. I believe that I cannot use the custom variable in the dial plan to match on in an expression search.. So.. I'm kinda stuck and looking for suggestions. I really dont want to set all the variables in the originate command in this case. thanks. Juan.