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Standard ECMA-281
Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Private User Mobility (PUM) - Registration Supplementary Service (PUMRSD)

3rd edition (December 2001)

The latest edition of this Ecma Standard is available here.

You can download the previous replaced "historical" editions of these Ecma Standards, free of charge:

File name Content
ECMA-281 1st edition Acrobat (r) PDF file
ECMA-281 2nd edition Acrobat (r) PDF file

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