Appendix O    Cause Code 
O-2 
 
Protocol error (e.g., unknown message) class 
No. (HEX)  Reason  No. (HEX)  Reason 
0060  invalid mandatory information  0064  conditional IE error 
0061 
message type non-existent or not 
implemented 
0065  message not compatible with protocol state 
0062 
message type not compatible with 
protocol state 
0066  recovery on timer expiry 
0063 
information element non-existent or 
not implemented 
0067  protocol error, unspecified 
 
Interworking class 
007F  Interworking, unspecified 
 
Mobility Management 
800B  PLMN not allowed  8022  Service option temporally out of order 
800C  Location area not allowed  8026  Call cannot be identified 
800D 
Roaming not allowed in this 
location area 
8030-803F  Retry upon entry into a new cell 
800F  No suitable cells in location area  805F  Semantically incorrect message 
8011  Network failure  8060  Invalid mandatory information 
8014  MAC failure  8061 
Message type non-existent or not 
implemented 
8015  Synch failure  8062  Message not compatible with protocol state 
8016  Congestion  8063 
Information element non-existent or 
implemented 
8017  GSM authentication unexpected  8064  Conditional IE error 
8020  Service option not supported  8065  Message not compatible with protocol state 
8021 
Request service option not 
subscribed 
806F  Protocol error, unspecified.