The present document is applicable to the stage three of the diversion supplementary services for the pan-European
Integrated 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 ITU-T Recommendation I.411 [9]) by means of the
Digital Subscriber Signalling System No. one (DSS1) protocol. Stage three identifies the protocol procedures and
switching functions needed to support a telecommunications service (see ITU-T Recommendation I.130 [8]).
The present document provides the Protocol Implementation Conformance Statement (PICS) proforma for the ISDN
DSS1 diversion supplementary services protocol as specified in EN 300 207-1 [3] in compliance with the relevant
requirements and in accordance with the relevant guidance given in ISO/IEC 9646-7 [7].
The supplier of a protocol implementation which is claimed to conform to EN 300 207-1 [3] is required to complete a
copy of the PICS proforma provided in annex A of the present document and is required to provide the information
necessary to identify both the supplier and the implementation.