Broadcast caller interface

We need a programmer familiar with WebRTC, Zoom, or any other digital caller interfaces that can help us customize an existing third-party software or create new. We need to be able to use a softphone interface with our existing VOIP phones to "park" calls and pick them up via the softphone AND create a caller cue either on park or other, that will play a live stream of our broadcast so while they are in the cue they can hear the show. Then when we bring someone "live" or off park, they'll be on the show. We already have the broadcast setup with a laptop to a mixing board. We just need the software interface done.