Error 0x80041B5C

Value: -2147214500 | 0x80041B5C | 2147752796

What does it mean ?

FAX_E_GROUP_IN_USE  
The fax server cannot remove an outbound routing group because it is in use by one or more outbound routing rules.
Value: 7004 | 0x1B5C | 0b0001101101011100

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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