cdr.h

#define AST_CDR_FAILED                (1 << 0)
#define AST_CDR_BUSY                (1 << 1)
#define AST_CDR_NOANSWER            (1 << 2)
#define AST_CDR_ANSWERED            (1 << 3)

FAILED 1
BUSY 2
NOANSWER 4
ANSWERED 8