Yeastar GSM Module

Yeastar P-Series PBX System and S-Series VoIP PBX provide flexible telephony interfaces combination while allowing for future scalability with unique modular design. Besides the built-in rich SIP capabilities, you can decide what types of extensions and physical trunks you need in your telephone system. When your business expands, more uses and concurrent calls can also be added easily to meet growing business needs.

Add Telephony Modules

All the telephony interfaces are modular and customizable, whether it’s FXS, FXO, ISDN BRI/PRI, or GSM/3G/4G.

S100, S300, P560, P570 require the combination of the Expansion Board and Telephony Modules to add interfaces.

• S20 has 2 onboard module slots.
• S50, S412, and P550 have 4 module slots.
• P560 allows 1 Expansion Board.
• S100 and P570 support 2 Expansion Boards.
• S300 supports 3 Expansion Boards.