Private Telecommunication Networks (PTN)
- Signalling Protocol at the S Reference Point - Identification
Supplementary Services (SSIG-ID)
2nd edition (June 1993)
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-157 1st edition
||Acrobat (r) PDF file