EN 301 657 V1.2.1 (2003)现行
Private Integrated Services Network (PISN); Specification, functional model and information flows; Private User Mobility (PUM); Call handling additional network features [ISO/IEC 17877 (2000) modified]
出版：European Telecommunications Standards Institute
专家解读视频
ONORM EN 301657:2003 - Identical
DIN EN 301657 (2004-03) - Identical
NF EN 301657:2003 - Identical
SS EN 301 657 Ed. 1 (2000) - Identical
NBN EN 301 657:2003 - Identical
PN EN 301 657:2005 - Identical
NEN EN 301657:2003 - Identical
