ITU-T E 121 NOTE-2004 Pictograms symbols and icons to assist users of the telephone and telefax services (Study Group 2)《辅助电话和电传业务用户的图标 符号和图符 2号研究组》.pdf

《ITU-T E 121 NOTE-2004 Pictograms symbols and icons to assist users of the telephone and telefax services (Study Group 2)《辅助电话和电传业务用户的图标 符号和图符 2号研究组》.pdf》由会员分享，可在线阅读，更多相关《ITU-T E 121 NOTE-2004 Pictograms symbols and icons to assist users of the telephone and telefax services (Study Group 2)《辅助电话和电传业务用户的图标 符号和图符 2号研究组》.pdf（1页珍藏版）》请在麦多课文档分享上搜索。

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.