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.

中国联通 关于适应3G的室内分布系统规划建设策略-China Unicom to adapt to 3G on the indoor distribution system planning and construction policy

SIM5210 device driver for windows. This is SIMCOM propriatary driver for SIM5210 3G module