ETSI EN 300 138-4
- Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (P
- standard by European Telecommunications Standards Institute, 05/01/2000
- Publisher: ETSI
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