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Standard ECMA-241
Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Message Waiting Indication Supplementary Service (MWISD)

4th edition (February 2002)

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-241 1st edition Acrobat (r) PDF file
ECMA-241 2nd edition Acrobat (r) PDF file
ECMA-241 3rd edition Acrobat (r) PDF file

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