Private Integrated Services Network (PISN)
- Specification, Functional Model and Information Flows - Call
Offer Supplementary Service (COSD)
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-191 1st edition
||Acrobat (r) PDF file