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Standard ECMA-177
Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Call Transfer Supplementary Service (CTSD)

3^rd edition (December 2001)

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-177 1st edition	NOT AVAILABLE
ECMA-177 2nd edition	Acrobat (r) PDF file

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