Cause of the call release (in decimal). The permitted values and its associated meaning are: Unassigned number (1); No route to the destination (3); Unnacceptable channel (6); Call awarded (7); Normal call clearing (16); User busy (17); No answer from user (18); No answer from notified user (19); Call rejected (21); Changed number (22); Destination out of order (27); Invalid format number (28); Normal, unspecified (31); No circuit/channel available (34); Network out of order (38); Temporary failure (41); Switching equipment congestion (42); Solicited circuit/channel no avaible (44); Resources unavailable (47); Quality of service not available (49); Bearer capacity not autorized (57); Bearer capacity not available (58); Service class not avaible (63); Bearer capacity not implemented (65); Canal type not implemented (66); Service not implemented (79); Reference value invalid (81); Identified channel not exist (82); Incompatible destination (88); Invalid message, unspecified (95); Compulsory Info element absent (96); Message type not implemented (97); Message not compatible with state (98); Info element no exist (99); Info element content invalid (100); Message not compatible with state (101); Recovery on timer expiry (102); Protocol error (111); Interworking (127).