| Заглавие на английском языке | Integrated Services Digital Network (ISDN) - Telephony 7 kHz and videotelephony teleservices; 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 300267-4:1998 as German standard) |