Paging & Intercom Module External Number

Is it possible to add an external number to a page group?

I created a page group for some SIP speaker phones (works great) In another phone system, that is connected via SIP trunk, I have a paging system that is an analog extension. If you dial the number, the speakers fire up and you talk. What I would like to do, is when the paging group is activated, this analog station can be called.

I can call the paging system from a sip phone in asterisk, so i know it works, its just getting the page group to call the number. I tried call forwarding a number to the paging system, but it didnt work.

Any thoughts?

Playing with FreePBX 13 / Asterisk 13.5.0