The present document contains the full specification of the speech codecs for use in the Terrestrial Trunked Radio
(TETRA) system.
The TETRA codec specified in clauses 4 to 8 is mandatory for all TETRA mobiles and networks. The AMR codec
specified in clauses 9 to 12 is optional. If the AMR codec is implemented, the equipment shall conform to the whole of
clause 9 to 12.