CSA ISO/IEC 15505:04 (R2019)
Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Message Waiting Indication Supplementary Service (Adopted ISO/IEC 15505:2003, third edition, 2003-04-01)
- English
- Publication Year 2004
- Published by CSA Group
- Reaffirmed in 2019