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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)

2^nd 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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