CAN/CSA-ISO/IEC 15506:04 (R2022)
Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Message Waiting Indication supplementary service (Adopted ISO/IEC 15506:2003, third edition, 2003-04-01)
- English
- Publication Year 2004
- Published by CSA Group
- Reaffirmed in 2022