The Yeastar TG100 connects GSM to VoIP networks to provide two-way communication: GSM/3G/4G to VoIP and VoIP to GSM/3G/4G. Yeastar TG100 Key Features GSM Voice Calls Maximum Cost Reduction Top Quality and Reliability Mobile Connectivity for SMB It allows you to connect most IP-PBX systems including all Yeastar IP-PBX Systems, and Softswitches to a GSM network; which can provide a sophisticated fallback solution when landlines and Telco SIP trunks go down, or be used to increase call traffic capacity by providing additional voice connection. Easy to use Simple and intuitive Web-based configuration saves you loads of time Mobile Trunkings Add GSM trunkings for business making high number of calls to mobile networks Bulk SMS Service Great tool for enterprises to manage customer relations and introduce special offers with a low cost Interoperability Interoperable with a broad list of Softswitch and IP-PBX