3.24 Generic digits (national use) The format of the generic digits parameter field is shown in Figure 24. 8 7 6 5 4 3 2 1 1 Encoding scheme Type of digits 2 digits . . . n digits Figure 24/Q.763 - Generic digits parameter The following codes are used in the subfields of the generic digits parameter: a) Encoding scheme 0 0 0 BCD even: (even number of digits) 0 0 1 BCD odd: (odd number of digits) 0 1 0 IA5 character 0 1 1 binary coded spare b) Type of digits 0 0 0 0 0 reserved for account code 0 0 0 0 1 reserved for authorisation code 0 0 0 1 0 reserved for private networking travelling class mark 0 0 0 1 1 reserved for business communication group identity reserved for national use 1 1 1 1 1 reserved for extension c) Digit Coding in accordance to the coding scheme and type of digits.