ETSI ETS 300 141-4
- Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) p
- standard by European Telecommunications Standards Institute, 10/01/1996
- Publisher: ETSI
$75.00$150.50
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