scope:

This second part of ETS 300 770 is applicable to the stage three of the Closed User Group (CUG) supplementary service for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided by European public telecommunications operators at the T B reference point or coincident S B and T B reference point (as defined in ITU-T Recommendation I.413 [7]) by means of the Digital Subscriber Signalling System No. two (DSS2) protocol. Stage three identifies the protocol procedures and switching functions needed to support a telecommunications service (see CCITT Recommendation I.130 [6]). This ETS provides the Protocol Implementation Conformance Statement (PICS) proforma for the B-ISDN DSS2 CUG supplementary service protocol as specified in ETS 300 770-1 [3] in compliance with the relevant requirements and in accordance with the relevant guidance given in ISO/IEC 9646-7 [5]. The supplier of a protocol implementation which is claimed to conform to ETS 300 770-1 [3] is required to complete a copy of the PICS proforma provided in annex A of this ETS and is required to provide the information necessary to identify both the supplier and the implementation.