KS X ISO/IEC 15506-2014(2019) Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network-Inter-exchange signalling protocol — Message Waiting Indication supplementary
2014KS X ISO/IEC 15506:2014 Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network-Inter-exchange signalling protocol — Message Waiting Indication supplementary service
0000 KS X ISO/IEC 15506_2003-2004(2009)
2007KS X ISO/IEC 15506:2007 Information technology－Telecommunications and information exchange between systems－Private Integrated Services Network－Inter-exchange signalling protocol－Message waiting indication supplementary services
2004KS X ISO/IEC 15506_2003:2004 Information technology－Telecommunications and information exchange between systems－Private Integrated Services Network(PISN)－Inter－Exchange Signalling Protocol－Message Waiting Indication Supplementary Service