SS7 - ISUP Nature of connection indicators parameter

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

B A              Satellite indicator
0 0             no satellite circuit in the connection
0 1             one satellite circuit in the connection
1 0             two satellite circuits in the connection
1 1             spare

D C              Continuity check indicator
0 0             continuity check not required
0 1             continuity check required on this circuit
1 0             continuity check performed on a previous circuit
1 1             spare

E               Echo control device indicator
0               outgoing echo control device not included
1               outgoing echo control device included

F-H             Spare