We'd like the ability to integrate custom apps with Remote Assist for HoloLens. Ideally this would be a C# library for Unity developers and a blueprint for Unreal.

Minimum viable would be to place a call to a known contact without using URL Activation. The calling app would need to know the result of the action (e.g. contact no longer exists, line was busy, etc.).

Other requests include:

- Call a contact (and get notified of result)
- Enumerate contacts so they can be displayed in-app
- Initiate a call without leaving the app
- Determine if a call is already in progress
- End a call in progress