ETSI EN 300 267-4
- Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Imp
- standard by European Telecommunications Standards Institute, 06/01/2000
- Publisher: ETSI
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