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ETSI EN 300 185-3
- Integrated Services Digital Network (ISDN); Conference call, add-on (CONF) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification for the user
- standard by European Telecommunications Standards Institute, 06/01/1998
- Publisher: ETSI
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Update to references to cite latest basic call standards et al. Incorporation of minor technical modifications where necessary.