ETSI ES 202 130-2007 人为因素(HF).用户接口.12键电话键区的字符指令系统,排序和分配(限于欧洲语言和在欧洲使用的语言)(版本2.1.2)
Human Factors (HF); User Interfaces; Character repertoires, orderings and assignments to the 12-key telephone keypad (for European languages and other languages used in Europe) (V2.1.2)