The ST-M25XTL-COS/COR is an interface module. It is designed to support the DIY connection between Solidtronic RoIP gateway and Motorola XTL/APX mobile radios. By using this cable, the RoIP system is NOT only support the Solidtronic iDats PTT Control Technology, but also Support the PoC-COS/COR and Radio-COS/COR PTT Control Technology of ST-RoIP4 and ST-RoIP4+D/W/R Series Standalone RoIP Gateway.