The Yeastar TG800 is a versatile VoIP GSM gateway that connects GSM, WCDMA, and 4G LTE networks to VoIP systems, enabling two-way communication for small to medium-sized businesses. It provides a reliable fallback during landline outages, enhances call traffic capacity, and features user-friendly web-based configuration for easy setup. The TG800 is designed to optimize business communications while reducing costs.