ATIS - Alliance for Telecommunications Industry Solutions
Scope
Scope and purpose Increasingly@ telecommunications services are making use of letters@ as well as numbers@ on numeric keypads for tasks such as directory@ dial-by-name@ entry of alphabetic numbers@ and the like. In addition@ it is recognized that many users of telecommunication services prefer to use letters instead of digits to code and remember numbers. Hence@ there is a need for a standard allocation of letters to the keys of numeric keypads used for telecommunications. This standard provides an allocation of the 26 letters of the Latin alphabet to the keys of such numeric keypads. This standard covers only the allocation of letters to the keys of the numeric keypad. Other human factors@ such as design of symbols@ engraving@ use of colors@ position of figures@ letters and symbols@ and the size of keys@ are considerations outside the scope of this standard. The association of a letter with a digit is made only as a mnemonic aid to the user of the keypad. No numerical value is given to the letter. When a key is actuated@ the signal sent to the associated system shall be the same as the signal which is sent for the digit which is allocated to the key. This standard is consistent with the allocations already standardized in the International Telecommunication Union (ITU) for telephones (ITU-T Recommendation E.161) and the International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) for text and office systems (ISO/IEC 9995-8)@ refer to clause 2.