Yeastar TG200 Gateway (TG200G) is in stock. The Yeastar TG200 Gateway (TG200G) connects GSM to VoIP networks to provide two-way communication: GSM/3G/4G to VoIP and VoIP to GSM/3G/4G. The Yeastar TG200 Gateway (TG200G) allows you to connect most IP-based telephone systems including Yeastar IP Phone Systems, and softswitches to a GSM or 3G WCDMA or 4G LTE; which can provide a sophisticated fallback solution when landlines go down, or be used to increase call traffic capacity by providing additional dial-tone.