Network management controls

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

        A               Temporary Alternative Routing (TAR) indicator
        0               no indication
        1               TAR controlled call
        bits G-B        Spare
        bit
        H               Extension indicator
        0               information continues through the next octet
        1               last octet