Cardphones are payphones that accept cards as a means of payment. Many Administrations have deployed cardphones that accept a variety of card types and technologies. (For further definition of CCITT-recommended credit card types, see Recommendation E.118 on the automated international telephone credit card system.) Cardphones provide an attractive alternative to users through added convenience and payment options. The service also provides benefits to Administrations both economic and operational.
ITU-T E.133-1993 Referenced Document
ITU-T E.118 The international telecommunication charge card Study Group 2*， 2006-05-01 Update
1988ITU-T E.133-1988 Operating Procedures for Cardphones - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 5 pp