The Yeastar TG400 is a 4-port GSM VoIP Gateway that allows businesses to connect their IP-based communication systems to mobile networks. It is designed for medium-sized businesses with up to 120 concurrent calls and supports 4 SIM card slots, providing businesses with greater flexibility and redundancy in their mobile communication.

The Yeastar TG400 offers a range of features, including:
- SIP-based Communication: The TG400 supports SIP-based communication, making it compatible with a wide range of IP-based communication systems.
- 4 GSM Channels: The TG400 provides 4 GSM channels, allowing businesses to make and receive calls to and from mobile networks.
- 4 SIM Card Slots: The TG400 supports 4 SIM card slots, allowing businesses to use multiple mobile network providers for their communication needs or provide redundancy for improved reliability.
- Voice Quality Enhancement: The TG400 offers advanced voice quality enhancement features, including adaptive jitter buffer and packet loss concealment, to ensure clear and reliable voice communication.
- SMS Messaging: The TG400 supports SMS messaging, allowing businesses to send and receive text messages to and from mobile networks.
- Call Routing: The TG400 supports call routing, allowing businesses to route calls to different destinations based on specific rules, such as time of day or caller ID.
- Remote Management: The TG400 can be easily managed through an intuitive web-based interface, allowing businesses to configure and manage their gateway device remotely.
Overall, the Yeastar TG400 is a scalable and reliable solution for medium-sized businesses that need to communicate with mobile networks while leveraging their existing IP-based communication systems. It provides reliable voice communication and advanced features, making it an ideal solution for businesses that need a cost-effective and flexible mobile communication solution.