标准号:ETS 300 950-1998
中文标准名称:ETS 300 950-1998
英文标准名称:Digital Cellular Telecommunications System (Phase 2+); Mobile Radio Interface Layer 3 Supplementary Services Specification; Formats and Coding (Second Edition; GSM 04.80 Version 5.1.1)
发布日期:1998-07-01
实施日期:2014-04-24