ISDN Types of C-CH. This object is a sum of 2**n, where n=Bit No. and Bit is '1': Bit No. ISDN Type 0 P 1 F 2 S Bit value '1'= Yes Bit value '0'= No Example: P=No, F=Yes, S=Yes (110H) will have the value 6. Each Type is NA (notApplicable) when v51VarCchType is none, secondary or standby. There is no special value for it, since each type can have only 2 values (1 or 0). When this object is NA, Agent will not refer its value (don't care).