[PBX API] Update caller name of active call (P-Series CE)

It would be great to be able to set the caller name of an incoming call via API. This would allow a developer to lookup the caller's name (or other information) for the operater to have on hand when they answer the call.

For example:

1. Websocket API is used to detect an incoming call.
2. Custom development looks up CRM system for information on caller
3. Custom development places API call to update active calls display name with information from CRM, such as if the caller has open tickets, or has an active or expired subscription.