Private Integrated Services Network (PISN)
- Inter-Exchange Signalling Protocol - Call Transfer Supplementary
3rd edition (December 2001)
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-178 1st edition
|ECMA-178 2nd edition
||Acrobat (r) PDF file