The present document specifies the Test Suite Structure and Test Purposes (TSS&TP) for the Service provider Terminal (SPT) of the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [3]) of implementations conforming to the stage three standard for the Teleaction service for the pan-European Integrated Services Digital Network (ISDN) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol, EN 301 145-1 [6]. Test Purposes described in this specification do not apply to Data Link establishment and Disconnection procedures contained in ETS 300 402-2 [5] or semi-permanent B channels in-band procedures in accordance with ETS 300 099 [4]. A further part of the present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation extra Information for Testing (PIXIT) proforma based on the present document. Other parts specify the TSS&TP and the ATS and partial PIXIT proforma for the End User Terminal (EUT) and the Teleaction Management Function (TMF) of the T reference point or coincident S and T reference point of implementations conforming to EN 301 145-1 [6].