EN 301 258 V1.2.1 (2004)现行
Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Recall supplementary service [ISO/IEC 15052 (2003), modified]
出版：European Telecommunications Standards Institute
专家解读视频
SS EN 301 258 Ed. 1 (1998) - Identical
NF EN 301258:2004 - Identical
NBN EN 301 258:2004 - Identical
DIN EN 301258 (2004-12) - Identical
ONORM EN 301258:2004 - Identical
PN EN 301 258:2005 - Identical
NEN EN 301258:2004 - Identical
