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DIN ETS 300058-4:1998-04

Отменен
Integrated Services Digital Network (ISDN) - Call Waiting (CW) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user; English version ETS 300058-4:1997
DIN ETS 300058-4:1998-04
Отменен