HEX;BIN;DEC;CAUSE DESCRIPTION

01;000 0001;1;Unallocated (unassigned) number 02;000 0010;2;No route to specified transit network 03;000 0011;3;No route to destination 06;000 0110;6;Channel unacceptable 07;000 0111;7;Call awarded and being delivered in an established channel 08;000 1000;8;Preemption ;<b>Class (001)</b>;;<b>NORMAL EVENT</b> 10;001 0000;16;Normal call clearing 11;001 0001;17;User busy 12;001 0010;18;No user responding 13;001 0011;19;No answer from user (user alerted) 14;001 0100;20;Subscriber absent 15;001 0101;21;Call rejected 16;001 0110;22;Number changed 1A;001 1010;26;Non-selected user clearing 1B;001 1011;27;Destination out of order 1C;001 1100;28;Invalid number format (address incomplete) 1D;001 1101;29;Facility rejected 1E;001 1110;30;Response to STATUS ENQUIRY 1F;001 1111;31;Normal, unspecified ;<b>Class (001)</b>;; <b>NETWORK CONGESTION</b> 22;010 0010;34;No circuit/channel available 26;010 0110;38;Network out of order 27;010 0111;39;Permanent frame mode connection out of service 28;010 1000;40;Permanent frame mode connection operational 29;010 1001;41;Temporary failure 2A;010 1010;42;Switching equipment congestion 2B;010 1011;43;Access information discarded 2C;010 1100;44;Requested circuit/channel not available 2E;010 1110;46;Precedence call blocked 2F;010 1111;47;Resource unavailable, unspecified ;<b>Class (011)</b>;; <b>SERVICE OR OPTION NOT AVAILABLE</b> 31;011 0001;49;Quality of service unavailable 32;011 0010;50;Requested facility not subscribed 35;011 0101;53;Outgoing calls barred within CUG 37;011 0111;55;Incoming calls barred within CUG 39;011 1001;57;Bearer capability not authorized 3A;011 1010;58;Bearer capability not presently available 3E;011 1110;62;Inconsistency in designated outgoing access information and subscriber class 3F;011 1111;63;Service or option not available, unspecified ;<b>Class (100)</b>;; <b>SERVICE OR OPTION NOT IMPLEMENTED</b> 41;100 0001;65;Bearer capability not implemented 42;100 0010;66;Channel type not implemented 45;100 0101;69;Requested facility not implemented 46;100 0110;70;Only restricted digital information bearer capability is available 4F;100 1111;79;Service or option not implemented, unspecified ;<b>Class (101)</b>;;<b>INVALID MESSAGE</b> (e.g. parameter out of range) 51;101 0001;81;Invalid call reference value 52;101 0010;82;Identified channel does not exist 53;101 0011;83;A suspended call exists, but this call identity does not 54;101 0100;84;Call identity in use 55;101 0101;85;No call suspended 56;101 0110;86;Call having the requested call identity has been cleared 57;101 0111;87;User not member of CUG 58;101 1000;88;Incompatible destination 5A;101 1010;90;Non-existent CUG 5B;101 1011;91;Invalid transit network selection 5F;101 1111;95;Invalid message, unspecified ;<b>Class (110)</b>;;<b>PROTOCOL ERROR</b> (e.g. unknown message) 60;101 0000;96;Mandatory information element is missing 61;101 0001;97;Message type non-existent or not implemented 62;101 0010;98;Message not compatible with call state or message type non-existent or not implemented 63;101 0011;99;Information element /parameter non-existent or not implemented 64;101 0100;100;Invalid information element contents 65;101 0101;101;Message not compatible with call state 66;101 0110;102;Recovery on timer expiry 6E;101 1110;110;Message with unrecognized parameter, discarded 6F;101 1111;111;Protocol error, unspecified ;<b>Class (111)</b>;;<b>INTERWORKING</b> 7F;111 1111;127;Interworking, unspecified