Code,Refusal Reason,Reference
0x00,Unknown,[RFC9174]
0x01,Completed,[RFC9174]
0x02,No Resources,[RFC9174]
0x03,Retransmit,[RFC9174]
0x04,Not Acceptable,[RFC9174]
0x05,Extension Failure,[RFC9174]
0x06,Session Terminating,[RFC9174]
0x07-0xEF,Unassigned,
0xF0-0xFF,Reserved for Private or Experimental Use,[RFC9174]