EN 301 657 : 1.2.1现行
PRIVATE INTEGRATED SERVICES NETWORK (PISN); SPECIFICATION, FUNCTIONAL MODEL AND INFORMATION FLOWS; PRIVATE USER MOBILITY (PUM); CALL HANDLING ADDITIONAL NETWORK FEATURES (ANFS)
出版：European Telecommunications Standards Institute
专家解读视频
Defines the services and signalling protocols applicable to Private Integrated Services Networks (PISN). The series uses the Integrated Services Digital Network (ISDN) concepts as developed by ITU-T and conforms to the framework of standards for Open Systems Interconnection (OSI) as defined by ISO/IEC.
PN EN 301 657 : 2005 - Identical
NBN EN 301 657 : 2003 - Identical
DS EN 301657 : 2004 - Identical
NF EN 301657 : 2003 - Identical
DIN EN 301657 : 2004 - Identical
NEN EN 301657 : 2003 - Identical
