Implement Incoming Call

As a business priority it has been to get outbound calling working up until this point. Now it is time for incoming calling to be programmed in. This is a lot more complex if I add in things like IVR and different users and organisations and sequential calling etc.

I need to do this issue one at a time. This is a long road and will involve many issues but consider this the main issue. It'll be complete when I can send and receive to an individual number associated with a person and not a service if that makes sense?