EN 300 172 V1.5.1 (2003)现行
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Circuit-mode basic services [ISO/IEC 11572 (2000) modified]
出版：European Telecommunications Standards Institute
专家解读视频
SS EN 300 172 Ed. 1 (1997) - Identical
NF EN 300172:2003 - Identical
NBN EN 300 172:2003 - Identical
I.S. EN 300172:2001 - Identical
PN EN 300 172:2005 - Identical
NEN EN 300172:2003 - Identical
DIN EN 300172 (2004-03) - Identical
ONORM EN 300172:2003 - Identical
