Error 0x80F00005

Value: -2131755003 | 0x80F00005 | 2163212293

What does it mean ?

RTC_E_PINT_STATUS_REJECTED_BUSY  
Busy
Value: 5 | 0x0005 | 0b0000000000000101

Where does it come from ?

FACILITY_PINT_STATUS_CODE  
PINT - PSTN/Internet Interworking (VoIP)
Value: 240 | 0x0F0 | 0b11110000

Other Errors for FACILITY_PINT_STATUS_CODE