EN 301 990 V1.1.1 (2003)现行
Private Integrated Services Network (PISN); Specification, functional model and information flows; Short message service supplementary service [ISO/IEC 21989 (2002) modified]
出版：European Telecommunications Standards Institute
专家解读视频
DIN EN 301990 (2004-03) - Identical
ONORM EN 301990:2003 - Identical
NEN EN 301990:2003 - Identical
PN EN 301 990:2005 - Identical
NF EN 301990:2003 - Identical
NBN EN 301 990:2003 - Identical
