KS 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
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