ETSI ETS 300 392-11-20
ETSI ETS 300 392-11-20
Terrestrial Trunked Radio (TETRA); Voice plus Data (V D); Part 11: Supplementary services stage 2; Sub-part 20: Discreet Listening (DL) Edition: 1European Telecommunications Standards Institute / 01-Aug-1999 / 39 pages