wi fi – IOS style call/VoIP to all/specific devices on local network

I get my calls on a master device. I might not have that device with me all the time, but it is always connected to local network either on Wi-Fi or its own mobile hotspot. My carrier supports VoIP calling and I have it enabled. All the devices have a static IP over network.

Incase someone calls, I want to receive/send any call I get on master device to other android/IOS/windows devices on network (most of the devices are without carrier, only Wi-Fi). This is very similar to IPhone calls sent to other Apple devices thus avoiding the need to reach out to phone.

Master device -> Send data to a server -> notification on all devices -> accept call on some device/start a call -> start talking.

Does anybody know of any app/small dev which will allow this.