📌 Yeastar TG400L – 4‑Port 4G LTE VoIP Gateway

The Yeastar TG400L (sometimes typed TG4OOL) is a 4G LTE VoIP gateway designed to connect mobile cellular networks (like 4G/LTE) with VoIP‑based phone systems such as IP‑PBX platforms. It enables your business telephone system to make and receive voice calls and SMS messages over the mobile network, providing an alternative trunk line or failover solution when traditional landlines or internet connections are unavailable.

🔧 Key Features

• 4 LTE (4G) Cellular Channels – Supports four mobile connections simultaneously for voice calls.
• VoIP Integration – Fully compatible with SIP‑based PBX systems and softswitches, allowing two‑way communication between mobile and VoIP networks.
• Voice and SMS Support – Enables voice calls and supports business SMS (e.g., SMS‑to‑email and email‑to‑SMS) for messaging workflows.
• HD Voice (VoLTE) – Delivers high‑quality mobile voice calls with echo cancellation and VoLTE support (carrier‑dependent).
• Automatic Fallback & Redundancy – Can serve as a backup communication route when landlines or VoIP trunks fail, helping maintain uptime and reliability.
• Web‑Based Management – Easy configuration and monitoring through a built‑in web interface.
• Cost Optimization – Helps reduce phone bills by routing outbound calls over mobile networks using least‑cost routing strategies.

⚙️ Technical Specifications (Typical)

• Model: Yeastar TG400L
• Cellular Ports: 4 × LTE channels
• Network Support: 4G LTE, fallback to 3G/2G
• VoIP Protocols: SIP, IAX2
• Transport: UDP, TCP, TLS, SRTP (depending on vendor firmware)
• Voice Codecs: G.711, G.722, G.726, G.729A, GSM, ADPCM, Speex (varies by firmware)
• Management: Web‑GUI configuration
• Power: AC 100–240 V or DC adapter depending on region
• Dimensions: ~213 × 160 × 44 mm (compact gateway)

📝 Product Description

The Yeastar TG400L 4G LTE VoIP Gateway bridges your IP PBX system with cellular networks, allowing you to place calls over 4G/LTE SIM cards directly without relying on fixed lines or broadband alone. This makes it especially useful for remote sites, branch offices, or areas with limited traditional telecom infrastructure. It also provides business continuity through failover and can lower call costs by leveraging mobile operator rates for outbound calling. With its web‑based configuration, multi‑channel support, and compatibility with major VoIP platforms, the TG400L is a flexible and cost‑effective communication solution for growing businesses.

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