Yeastar D30 100 User 30 Concurrent Call DSP Module
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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.
Yeastar YST-D30 Compatibility :
Yeastar S100
Yeastar S300