EN 301 255 : 1.2.1现行
PRIVATE INTEGRATED SERVICES NETWORK (PISN); INTER-EXCHANGE SIGNALLING PROTOCOL; MESSAGE WAITING INDICATION SUPPLEMENTARY SERVICE
出版：European Telecommunications Standards Institute
专家解读视频
Contains stage 3 description of the message waiting supplementary service. See DTR/ECMA-00002 (ECMA-TR/SVC) for service description. See ENV41005 for definition of stage 3.
PN EN 301 255 : AUG 2005 - Identical
DIN EN 301255 : 2004 - Identical
NBN EN 301 255 : 2004 - Identical
DS EN 301255 : 2006 - Identical
NEN EN 301255 : 2004 - Identical
NF EN 301255 : 2006 - Identical
