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Standard ECMA-283
Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Private User Mobility (PUM) - Call Handling Additional Network Features (PUMCHSD)

2nd edition (June 2000)

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:

File name Content
ECMA-283 1st edition Acrobat (r) PDF file

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