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Standard ECMA-282
Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Private User Mobility (PUM) - Registration Supplementary Service (QSIG-PUMR)

3rd edition (December 2001)

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-282 1st edition Acrobat (r) PDF file
ECMA-282 2nd edition Acrobat (r) PDF file

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