[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Launches the VoIP background process.
Assembly: Microsoft.Phone (in Microsoft.Phone.dll)
The calling application does not have the ID_CAP_VOIP capability.
The VoIP application's background process can only be launched by the UI process of a VoIP application that is in the foreground.
The system was unable to launch the background process.