Yeastar TG400L LTE Gateway for Business Communications

The Yeastar TG400L is a compact LTE/4G VoIP gateway designed to connect mobile networks with IP telephony systems. This device enables businesses to leverage cellular connectivity for voice communications through their existing PBX infrastructure. It serves organizations seeking cost-effective mobile integration, backup connectivity solutions, or primary telephony in areas with limited landline availability.

Technical Specifications

Network Connectivity

• LTE Bands: B1/B3/B7/B8/B20/B38/B40/B41 (region-dependent)
• Fallback Support: 3G WCDMA, 2G GSM/GPGE compatibility
• SIM Slots: 4 standard SIM card slots with hot-swappable capability
• Network Interface: 1x 10/100Mbps Ethernet port

Voice Channels

• Maximum Concurrent Calls: Up to 4 simultaneous channels
• Voice Codecs: G.711A/U, G.722, G.726, G.729A, GSM, iLBC
• DTMF: RFC2833, SIP INFO, In-band support
• Echo Cancellation: ITU-T G.168 compliant

System Requirements

• Protocols: SIP v2.0 (RFC3261)
• Management: Web-based GUI, CLI via Telnet/SSH
• Security: TLS, SRTP encryption support
• Power: 12V DC, 1A (included adapter)

Physical Characteristics

• Dimensions: 174mm × 104mm × 27mm (6.9″ × 4.1″ × 1.1″)
• Weight: 320g (11.3 oz)
• Operating Temperature: 0°C to 40°C (32°F to 104°F)
• Humidity: 10% to 90% non-condensing

Use Cases and Applications

Backup Connectivity Solution

The TG400L provides essential redundancy for businesses requiring continuous phone service. When primary landlines fail, the gateway automatically routes calls through LTE networks. This configuration proves valuable for financial services, healthcare facilities, and customer support centers where communication downtime directly impacts operations.

Remote Location Connectivity

Organizations operating in rural areas or temporary sites benefit from LTE-based telephony without traditional infrastructure. Construction companies, outdoor event venues, and agricultural operations can establish full-featured phone systems using cellular networks as the primary connection method.

Cost Optimization Strategy

Businesses can route calls strategically between landline and mobile networks based on rate optimization. Additionally, the Yeastar TG400L enables calls to mobile destinations through SIM cards rather than expensive landline-to-mobile tariffs, potentially reducing monthly communication expenses significantly.

Multi-Carrier Deployment

The quad-SIM architecture allows simultaneous connections to different carriers for geographic coverage optimization. International businesses can maintain local presence numbers across regions, while delivery services and field operations benefit from improved signal reliability through carrier diversity.

Legacy System Migration

Organizations transitioning from traditional phone systems to VoIP can maintain mobile connectivity during the migration period. The gateway bridges existing cellular contracts with new IP infrastructure, allowing gradual transition without service interruption or contract penalties.