ITU-T E.116-1989
International Telephone Credit Cards for Use in a Non-Automated Environment - Telephone Network and ISDN - Operation@ Numbering@ Routing and Mobile Service (Study Group II) 3 pp

Standard No.

ITU-T E.116-1989

Release Date

1989

Published By

ITU-T - International Telecommunication Union/ITU Telcommunication Sector