scope:

The present ETS specifies the stage 3 description of the Supplementary Service Short Number Addressing (SS-SNA) for the Terrestrial Trunked Radio (TETRA). SS-SNA enables the served user to send an abbreviated number instead of a full identity to the infrastructure. Additionally SS-SNA may either invoke or suppress other supplementary services. Man-Machine Interface (MMI) and charging principles are outside the scope of this ETS. Supplementary service specifications are produced in three stages according to the method defined in CCITT Recommendation I.130 [1].