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Standard ECMA-203
Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Intrusion Supplementary Service (QSIG-CI)

4th 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-203 1st edition NOT AVAILABLE
ECMA-203 2nd edition Acrobat (r) PDF file
ECMA-203 3rd edition Acrobat (r) PDF file

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