The Yeastar D30 card increases the capacity of Series S100 and S300 IP PBX System. Each D30 card adds 100 VoIP users and 30 concurrent calls to the PBX System. Yeastar S100 support one additional DS30 card and Yeastar S300 support two D30 Card. DSP Expansion Module for Yeastar S100 and S300 Systems. Install on the motherboard to expand capacity by 100 extensions and 30 concurrent calls. Use up to 1 module on the S100 and up to 2 modules on the S300.
