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Standard ECMA-251
Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Common Information Additional Network Feature (QSIG-CMN)

3^rd edition (December 2001)

The latest 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-251 1st edition	Acrobat (r) PDF file
ECMA-251 2nd edition	Acrobat (r) PDF file

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