yeastar modules and accessories

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. The  yeastar modules and accessories include S2 Module with 2 FXS Ports Add 2 analog telephones, O2 Module with 2 FXO Ports and  2 analog PSTN (POTS) lines, SO Module with 1 FXS Port & 1 FXO Port, GSM Module with 1 GSM Channel, 4G LTE Module with 3G/4G Voice Call & Data