Yeastar TG800L LTE/4G Gateway 8x channel content_copy

The Yeastar TG800L is a VoIP gateway that directly connects mobile networks (GSM, UMTS/3G, LTE/4G) with IP-based telephone systems. It enables bidirectional communication: calls can be routed both from VoIP systems via the mobile network (termination) and from mobile numbers into the VoIP network (origination). The device is specifically designed for integration into existing IP telephone systems (IPPBX) and softswitch systems, serving as a cost-effective fallback solution when the fixed-line connection fails. The connection is established via eight independent LTE channels, allowing multiple calls to be handled simultaneously.

Applications
This gateway is suitable for businesses requiring redundant telephony infrastructure to remain reachable in case of fixed-line failure. It is commonly used in call centers, administrations, or industrial environments where high communication availability is essential. Additionally, it enables the use of mobile networks for cost-effective calls, especially for mobile-to-mobile connections or via SIP trunks. The support for mass SMS via a web interface extends its use to areas relying on SMS-based notifications.

Functions and Specifications in Detail
The device features two 10/100 Mbit/s Ethernet LAN interfaces for network connection and communication with the IP telephone system. The web-based management interface allows easy configuration and control of all functions, including network settings, QoS, VLANs, firewall rules, and OpenVPN connections. Support for protocols such as SIP and IAX2 ensures high compatibility with common IP telephony systems. Voice processing is performed using various codecs, including G.711 (A-law/U-law), G.722, G.729A, GSM, ADPCM, and Speex, enabling flexible adaptation to different network requirements.

Technology Explained Simply
The eight LTE channels of the TG800L allow simultaneous use of eight SIM cards, increasing availability and fault tolerance. Support for LTE bands such as 800/850/900/1800/2100 MHz (depending on the module, also 2300/2500/2600 MHz) ensures broad coverage across various mobile networks. The integrated NAT traversal function with support for Static NAT and STUN enables a secure and stable connection, even when the device is located behind a router or firewall. Echo cancellation according to ITU-T G.168 ensures clear voice quality, especially in IP network connections.

Compatibility and Accessories
The gateway is compatible with established IPPBX systems and softswitch solutions. It supports network protocols such as FTP, TFTP, HTTP, HTTPS, and SSH, simplifying management and maintenance. The use of OpenVPN enables a secure, encrypted connection, for example, for remote administration or integration into secured corporate networks. The ability to send and receive SMS messages via a web interface extends functionality for applications such as alarm systems or notification services.

Mounting and Installation
The device measures 340 × 210 × 44 mm and is suitable for 48,3 cm ( 19 inch ) racks, with an optional rack-mount available. Installation is done via the two Ethernet ports, which are connected to the local network. Power supply is via AC 100–240 V, enabling worldwide use. The operating temperature ranges from 0 °C to 40 °C, and the relative humidity during operation is 10–90 %, non-condensing.

Operational Advantages
By using mobile networks for telephone connections, significant cost savings can be achieved, especially for calls within a mobile network. The fallback function ensures high telephony availability, even when the fixed-line connection fails. The web-based management and support for numerous network protocols simplify integration and maintenance. Simultaneous use of eight LTE channels enables high capacity and redundancy.