3.30 Location number The format of the Location number field is shown in Figure 30. 8 7 6 5 4 3 2 1 1 Odd/ even Nature of address indicator 2 INN Numbering plan Ind. Address presentation restricted indicator Screening 3 2nd address signal 1st address signal : n Filler (if necessary) nth address signal Figure 30/Q.763 - Location number parameter field The following codes are used in the subfields of the location number parameter field: a) Odd/even indicator: see 3.9 a). b) Nature of address indicator 0 0 0 0 0 0 0 spare 0 0 0 0 0 0 1 reserved for subscriber number (national use) 0 0 0 0 0 1 0 reserved for unknown (national use) 0 0 0 0 0 1 1 national (significant) number (national use) 0 0 0 0 1 0 0 international number spare reserved for national use 1 1 1 1 1 1 1 spare c) Internal Network Number indicator (INN) 0 routing to internal number allowed 1 routing to internal number not allowed d) Numbering plan indicator 0 0 0 spare 0 0 1 ISDN (telephony) numbering plan (Recommendation E.164) 0 1 0 spare 0 1 1 Data numbering plan (Recommendation X.121) (national use) 1 0 0 Telex numbering plan (Recommendation F.69) (national use) 1 0 1 private numbering plan 1 1 0 reserved for national use 1 1 1 spare e) Address presentation restricted indicator 0 0 presentation allowed 0 1 presentation restricted 1 0 address not available (national use) 1 1 spare NOTE - When the address presentation restricted indicator indicates address not available, the subfields in items a), b), c) and d) are coded with 0's, and the screening indicator is set to 11 (network provided). f) Screening indicator 0 0 reserved 0 1 user provided, verified and passed 1 0 reserved 1 1 network provided g) Address signals: see 3.26 h). h) Filler: see 3.9 f).