ISO/IEC 21989:2002现行
Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Short message service
出版：International Organization for Standardization
专家解读视频
ONORM EN 301990:2003 - Identical
NEN ISO/IEC 21989:2002 - Identical
CSA ISO/IEC 21989:2004 (R2017) - Identical
DIN EN 301990 (2004-03) - Identical
KS X ISO/IEC 21989:2004 - Identical
KS X ISO/IEC 21989:2014 - Identical
