1、Union internationale des telecommunications Place des Nations 1211 GENEVE 20 Suisse Switzerland Suiza COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION Geneva, 11 October 2004 ITU TELECOMMUNICATION STANDARDIZATION SECTOR Subject: Erratum 1 (10/2004) to ITU-T Recommendation E.12
2、1 (06/2004), Pictograms, symbols and icons to assist users of the telephone and telefax services Replace symbol No. 2 in Figure 12/E.121 “Additional symbols for telecommunication functions“ by the following one: E.121_F12aSymbol No.2: Telephone ringing soundApplication:On telecommunications equipment, to indicatethe control for a telephone ringing sound, or thestatus that the signal is calling.
