SSH ETS 300 392-10-24:2000 ed.2

Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 24: Call Retention (CRT)

Scope

This ETS specifies the supplementary service Call Retention SS-CRT which is applicable to various basic services supported by TETRA SwMIs. Basic services are specified in ETS 300 392-2 [4]. SS-CRT is a supplementary service which applies either during call establishment or once call is established to protect a call from pre-emption by another call of lower priority. Supplementary service specifications are produced in three stages, according to the method described in ITU-T Recommendation I.210 [2]. The present document contains the stage 1 specifications of SS-CRT. The stage 1 descriptions specify the supplementary services as seen by users of networks.