Optional backward call indicators

           8  7  6  5  4  3  2  1
        1  H  G  F  E  D  C  B  A


        A               In-band information indicator
0               no indication
1               in-band information or an appropriate pattern is now available
        bit
        B               Call diversion may occur indicator
0               no indication
1               call diversion may occur
        bit
        C               Simple segmentation indicator
0               no additional information will be sent
1               additional information will be sent in a segmentation message
        bit
        D               MLPP user indicator
0               no indication
1               MLPP user
        bits H-E        Reserved for national use