ETSI TS 101 818-4
- Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Trunk Hunting (TH) supplementary service; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
- standard by European Telecommunications Standards Institute, 11/01/2001
- Publisher: ETSI
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