Computerized Information Service for Telephone Subscriber Numbers in Foreign Countries (Directory Assistance), Reserved for Operators (Study Group I) 18 pp

Computerized information service for telephone subscriber numbers in foreign countries (directory assistance), reserved for operators

Computerized information service for telephone subscriber numbers in foreign countries (directory assistance), reserved for operators

Computerized information service for telephone subscriber numbers in foreign countries (directory assistance), reserved for operators

Computerized Information Service for Telephone Subscriber Numbers in Foreign Countries (Directory Assistance), Reserved for Operators - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 11 pp

Computerized Information Service for Telephone Subscriber Numbers in Foreign Countries (Directory Assistance), Reserved for Operators. Recommendation E.115. Telephone Network and ISDN. Operation, Numbering, Routing and Mobile Service.

Telephone Network and ISDN: Operation, Numbering, Routing and Mobile Service. Recommendation E.115. Computerized Information Service for Telephone Subscriber Numbers in Foreign Countries (Directory Assistance), Reserved for Operators (Re-Announcement of PB92-209618).

Computerized Directory Assistance - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group 1) 26 pp

Directory assistance access to intercept telephone numbers

International Telephone Directory Assistance Service and Public Access - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group 1) 6 pp