oxo addressbook call internal to a hunting group

I don't know if this is a "help request" or a "feature request" but how could rainbow users call to PBX hunting groups internally based on a label/name of that group like they could do on their phones?

For example teleworkers want to call to hunting group "CSFR customer service france" (linked number is 599). Is it possible to search in rainbow for "CSFR" ?

Rainbow search doesn't know the hunting group labels, only alternative is that we give all users a list with hunting group numbers?

Also tested with:

- global speed dials but search isn't looking in this "speed dial" list also.

- add to the "business directory" but there are no internal numbers allowed.

I hope we are missing something or could enable something i didn't found yet?