CONTENTS - ITU-T Rec. E.161 (02/2001) Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network

1     Use of digits and letters on telephone sets
2     Rotary dials
3     Push-buttons or keys
        3.1     Ten push-buttons
                  3.1.1     Arrangement and numbering
                  3.1.2     Symbols
        3.2     12 push-buttons
                  3.2.1     Arrangement
                  3.2.2     Symbols
        3.3     Dual mode and engraving
        3.4     Design of symbols
        3.5     Position of figures, letters and symbols on push-button sets
        3.6     Tactile identifier on the "5" button
4     Additional push-buttons for use on telephones
        4.1     General
        4.2     Specific recommendations
                  4.2.1     Register recall push-button