ETSI ETS 300 392-10-20
ETSI ETS 300 392-10-20
Terrestrial Trunked Radio (TETRA); Voice plus Data (V D); Part 10: Supplementary services stage 1; Sub-part 20: Discreet Listening (DL) Edition: 2European Telecommunications Standards Institute / 01-May-1999 / 21 pages