This second part of ETS 300 668 is applicable to the stage three of the User-to-User Signalling (UUS) supplementary service for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided by European public telecommunications operators at the TB reference point or coincident SB and TB reference point (as defined in ITU-T Recommendation I.413 [8]) by means of the Digital Subscriber Signalling System No. two (DSS2). Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service (see CCITT Recommendation I.130 [7]).
IN_DEVELOPMENT
prSSH ETS 300 668-2:1996 ed.1
40.20
DIS ballot initiated: 12 weeks
Feb 9, 2026
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