scope:

This ETS specifies the stage 2 description of the Supplementary Service Talking Party Identification (SS-TPI) for the Terrestrial Trunked Radio (TETRA). The SS-TPI supplementary service enables connected parties in a call to receive the identification of the talking party. The SS-TPI is activated against individual identity in individual call and against group identity in group calls. Man-Machine Interface and charging principles are outside the scope of this ETS. Supplementary service specifications are produced in three stage according to the method defined in CCITT Recommendation I.130 [4]. The stage 2 description identifies the functional capabilities and the information flows needed to support the supplementary service as specified in its stage 1 description (see ETS 300 392-10-3 [2]). The stage 2 description is followed by the stage 3 description, which specifies the protocols at the air interface and at the various Inter-System Interfaces (ISI) to support the service.