Yeastar D30 Expansion DSP Module for Yeastar series S100 and S300 Systems. Install on the motherboard to expand capacity by 100 extensions and 30 concurrent calls. The Yeastar D30 DSP (digital signal processor) module can be inserted into a Yeastar S100 or S300 IP-PBX, letting the VoIP PBX support an additional 100 users and 30 concurrent calls. Expand the power of your VoIP phone system without needing expensive hardware with this module. Thank you for Shopping at Ovidian Tech Solutions. An award-winning online shop where you will find all the varieties and latest trends in Yeastar D30 Expansion DSP Module. We?ve come a long way, so we know exactly which direction to take when supplying you with this high quality yet budget-friendly Yeastar D30 Expansion DSP Module. Our top priority is the interest of our customers and we hope you will enjoy our products as much as we enjoy making them available to you. Call / WhatsApp on +254 798 870 738 to place your order and enjoy our fast delivery.