Yeastar DSP Expansion Module with 100 VoIP Users & 30 Concurrent Calls D30

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.