This ETSI TETRA codec.It enable intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include: -speech coding -FEC, CRC, interleaving -protocol amendment inter-system interface. （ 还有配套的两个包）-This ETSI TETRA codec.It enable Intercommunication between TETRA and other 3G networks without transcoding, and to provide enhanced voice quality for TETRA by using the latest low bit rate voice codec technology. Areas involved expected to include :-speech coding - FEC. CRC, interleaving-protocol amendment inter-system interface. (also supporting two packages)