The UC2000-VG series GSM/WCDMA/LTE VoIP Gateways are multi-functional gateway which helps to effectively implement calls between 4G/3G/2G mobile network and VoIP network. It capable of making incoming/outgoing calls through the 4G network with VoLTE as well as GSM/WCDMA network, users can easily choose network mode on demands. Moreover, with the opened API, the users could build their own application software to send SMS/USSD messages or bulk SMS messages, or push their text messages from email, HTTP, etc. It has great performance in software features also in the new hardware structure design. The gateway provides low cost, easy and flexible IP telephony solution to enterprise, SMEs and business office, etc.