Yeastra Gateways Tg 400

The Yeastar TG400 is a compact VoIP GSM/4G LTE gateway built to bridge cellular networks directly with IP-based phone systems. This device supports 4 simultaneous mobile calls via four independent internal SIM cards. It helps businesses reduce telecom expenses by routing corporate calls directly through mobile-to-mobile connections rather than pricier landlines. The front panel features a single 10/100 Mbps RJ45 Ethernet port for network connectivity, a hardware reset button, and clear LED indicators. These lights track power status, overall system operation, and individual SIM network registration or active call states. Beyond standard voice routing, the TG400 supports bulk SMS messaging and functions as a critical cellular backup line to protect communication channels during internet or landline outages.