Video calling(webRTC?) with call routing for Europe?

i need your help!

I looking for a system with multiple agents where i can configure the routing myself. So like this:

Agent 1 (tablet with app that is only able to make calls by the press of a button) makes a call and based on the hour of the day the call goes to Agent 2 (Customer support) or Agent 3 (Manager).

The idea is to configure Agent 1 on a fixed tablet in a lobby, where they can call if they need help.

On top of this we need this to be installable (android?) apps, because we want the phone of Agent 2 or 3 to start ringing and auto opening a screen to answer the call.

So i have found onsip.com, but they don't offer their service in Europe and it's not exactly what I'm looking for i think.

Any help in the right direction is much appreciated! :)