Description: Call Release Reason determined by the numeric code given by the index. It is the real information contained in the table about released calls. The correspondence between the numeric code and the cause is as follows: (1) No attributed number, (3) No route to destiny, (6) Unacceptable channel, (7) Call over already established channel, (16) Normal Call Release, (17) Busy user, (18) User do not answer, (19) Warned user. No answer from user, (21) Refused call, (22) Changed number, (27) Destiny out of service, (28) Non valid number format, (31) Normal release, (34) Non available circuit or channel, (38) Network out of service, (41) Temporal failure, (42) Congestion in conmutation node, (44) Circuit demanded or not available channel, (47) Not available resources, (49) Non available quality of service, (57) Non authorized carrier capacity, (58) Non available carrier capacity, (63) Non available service class or option, (65) Non performed carrier capacity, (66) Non performed channel type, (79) Non performed service or option, (81) Non valid call reference value, (82) Non-existent identified channel, (88) Incompatible destiny, (95) Non valid message, (96) Mandatory information element missing, (97) Type of missing message, (98) Missing or not implanted message, (99) Information element missing, (100) Non valid information element content, (101) Incompatible message with call state, (102) Recovery after temporizer expiration, (111) Protocol error, (127) Interworking.