Yeastar TG400 is a compact 4 channels VoIP GSM/CDMA/UMTS gateway that connects GSM/CDMA/UMTS network with VoIP. Top Quality and Reliability Rich functionalities A robust feature set that fulfills your various needs and cuts communication cost Easy management Simple and intuitive Web-based configuration saves you loads of time Reliable performance Stable with advanced hardware and software architecture Excellent interoperability Interoperable with a broad list of softswitch, PBX, and IP-PBX like Elastix and Lync Server