| Заглавие на английском языке | Integrated Services Digital Network (ISDN); Supplementary service interactions - 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 (Endorsement of the English version ETS 300195-4:1998 as German standard) |