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Standard ECMA-165
Private Integrated Services Network (PISN) - Generic Functional Protocol for the Support of Supplementary Services - Inter-Exchange Signalling Procedures and Protocol (QSIG-GF)

4th edition (June 2001)

The lastest edition of this Ecma Standard is available here.

You can download the previous replaced "historical" editions of this Ecma Standard, free of charge:

File name Content
ECMA-165 1st edition Acrobat (r) PDF file
ECMA-165 2nd edition Acrobat (r) PDF file
ECMA-165 3rd edition Acrobat (r) PDF file

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