Private Integrated Services Network (PISN)
- Inter-Exchange Signalling Protocol - Transit Counter Additional
Network Feature (QSIG-TC)
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-225 1st edition
||Acrobat (r) PDF file