VoIP 4G Gateway Yeastar TG Series — 4G Trunking for IP-PBX Systems

The Yeastar TG Series comprises VoIP 4G gateways designed to connect 4G LTE mobile networks directly to IP-PBX and VoIP infrastructure, enabling two-way voice communication between mobile and fixed networks. These devices serve as 4G SIP trunking solutions for IP-based telephony systems or as cost-effective fallback channels when landline or SIP connectivity is unavailable. The series scales from 2 to 16 independent 4G channels across models TG200, TG400, TG800, and TG1600.

Voice processing supports SIP and IAX2 protocols with codecs including G.711, G.722, and G.729A, echo cancellation per ITU-T G.168, and encrypted transport via TLS and SRTP. VoLTE is supported where carrier networks allow. SMS functionality — including bulk messaging, USSD, SMS Center management, and an open API — extends the gateway's utility beyond voice calls, making it applicable to automated notification and messaging workflows.

TG Series gateways integrate into existing VoIP environments as active 4G trunks or redundant failover links alongside SIP or PSTN connections. Network management features include OpenVPN, VLAN segmentation, QoS/ToS, DDNS, and NAT traversal, supporting deployment across complex network topologies. Configuration is fully web-based, with firmware upgrade via HTTP/TFTP and backup/restore support for operational continuity.

These gateways are deployed in enterprises running IP-PBX systems that require 4G trunking for cost reduction through mobile-to-mobile call routing, in organizations needing automatic voice backup when fixed lines fail, and in locations where SIP or PSTN infrastructure is limited or unreliable. High-channel models TG800 and TG1600 are suited for call centers, regional carriers, and multi-site deployments with sustained high voice traffic volumes.