https://learn.microsoft.com/en-us/dotnet/api/microsoft.rtc.collaboration.localendpoint.registerforincomingcall?view=ucma-api&redirectedfrom=MSDN
LocalEndpoint.RegisterForIncomingCallTCall Method (Microsoft.Rtc.Collaboration) | Microsoft Learn
Registers a delegate to handle incoming calls for a specific modality.
methodmicrosoftrtccollaborationlearn