OEVE/OENORM EN 300392-3-3 V1.4.1
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) (ETSI EN 300 392-3-3 V1.4.1 (2017-12))