Private Integrated Services Network (PISN)
- Specification, Functional Model and Information Flows - Do Not
Disturb and Do Not Disturb Override Supplementary Services (DND(O)SD)
2nd edition (June 1997)
The latest edition of this Ecma Standard is available here.
You can download the previous replaced "historical" edition of this Ecma Standard, free of charge:
|ECMA-193 1st edition
||Acrobat (r) PDF file