Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 8: Generic Speech Format Implementation (V1.2.1)
The present document specifies speech transmission format implementation independent of SwMI type. The present document defines the format of user information that is transported between two SwMIs using the TETRA ISI. The present document covers how TETRA air interface circuit mode traffic is encoded for transport over various media.