Application for integrating freepbx PBX with CRM

I am looking for a programmer to write a plugin integrating my telephone exchange (freepbx providing API) with external applications. I would like to work with baselinker, erpbox and then further integrations. So I'm looking for someone for a longer cooperation for a few projects.

By "plug-in" I mean an application installed on a computer, which, connected to the telephone exchange, would allow, for example, displaying a form with orders and customer data, as well as editing them - if the number from which the call came is already stored in the system.

Please send me a proposal with a price offer only.