Error 0x8054820B

Value: -2141945333 | 0x8054820B | 2153021963

What does it mean ?

E_MBN_VOICE_CALL_IN_PROGRESS  
Voice call in progress.
Value: 33291 | 0x820B | 0b1000001000001011

Where does it come from ?

FACILITY_POWERSHELL  
Power Shell
Value: 84 | 0x054 | 0b01010100

Other Errors for FACILITY_POWERSHELL