ETSI ETS 300 771-4 Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-network interface layer 3 specification for point-to-multipoint call/bearer control; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Informati

standard by European Telecommunications Standards Institute, 09/01/1998