ETSI ETS 300 392-3-3
ETSI ETS 300 392-3-3
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 3: Additional Network Feature Group Call (ANF-ISIGC)
standard published 03/01/2000 by European Telecommunications Standards Institute
