scope:

The present document specifies the Test Suite Structure and Test Purposes (TSS&T P) for the User side of the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [12]) of implementations conforming to the stage three standard for supplementary service interactions for the pan-European Integrated Services Digital Network (ISDN) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol, EN 300 195-1 [2]. A further part of EN 300 195 specifies the Abstract Test Suite (ATS) and partial PIXIT proforma based on the present document. Other parts specify the TSS&T P and the ATS and partial PIXIT proforma for the Network side of the T reference point or coincident S and T reference point of implementations conforming to EN 300 195-1 [2].