scope:

This second part of ETS 300 185 is applicable to the stage three of the Conference call, add-on (CONF) supplementary service for the pan-European hegrated Services Digital Network (ISDN) as provided by European public telecommunications operators at the T reference point or coincident S and T reference point (as defined in CCITT Recommendation 1.41 1 i1011 by means of the Digital Subscriber Signalling System No. one (DSS1). Stage three identifies the protocol procedures and switching functions needed to support a telecommunications service (see CCITT Recommendation 1.130 191).

This ETS provides the Protocol Implementation Conformance Statement (PICS) proforma for the ISDN DSS1 CONF supplementary service protocol as specified in ETS 300 183 [1 ] (stage one), ETS 300 184 [2] (stage two) and ETS 300 185-1 i31 (stage three) in compliance with the relevant requirements and in accordance with the relevant guidance given in ISO/IEC 9646-7 [8].