EN 300 256 V1.3.1 (2004)现行
Private Integrated Services Network (PISN); Specification, functional models and information flows; Call diversion supplementary service [ISO/IEC 13872 (2003), modified]
出版：European Telecommunications Standards Institute
专家解读视频
NBN EN 300 256:2004 - Identical
NF EN 300256:2004 - Identical
PN EN 300 256:2005 - Identical
NEN EN 300256:2004 - Identical
ONORM EN 300256:2004 - Identical
DIN EN 300256 (2004-12) - Identical
