The Yeastar D30 expansion module can be used to expand the System capacity of a Yeastar IP PBX device. With D30 module, users will be able to add up to 100 VoIP Users and make up to 30 concurrent calls. The Yeastar D30 expansion module can support Yeastar S100 VoIP PBX and Yeastar S300 VoIP PBX. Yeastar S Series VoIP PBX are Scalable and Modular Yeastar S-Series VoIP PBX provides flexible telephony interfaces combination while allowing for future scalability with unique modular design. Besides the built-in rich SIP capabilities, S-Series lets you decide what types of extensions and physical trunks you need in your telephone system. When your business grows, adding more users and concurrent calls is also possible with S-Series.
