ETSI EN 300 188-4
- Final draft Version 1.4.1Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Inform
- standard by European Telecommunications Standards Institute, 12/01/2001
- Publisher: ETSI
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