The Yeastar D30 DSP Expansion Module is an excellent choice for businesses aiming to enhance their communication capabilities. With the D30, you can significantly expand your PBX system's capacity, adding 100 extensions and accommodating 30 additional concurrent calls. Its compatibility with Yeastar S100 and S300 VoIP PBX systems makes it versatile, and its durable construction ensures long-lasting protection for your investment. By improving call quality and performance, the D30 empowers businesses to provide efficient communication experiences for clients and employees.