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

3rd 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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