Telephony Modules and Expansion Boards

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 ports

The Yeastar S-series & P-series have a modular structure. Depending on your requirements, a composition can be made with the available modules (FXS, FXO, ISDN2, GSM/3G). In the S20 two modules can be placed as standard and in the S50 even 4. The S100 and S300 do not have a standard place for modules, but with the use of an extension module this is still possible. You will then even have access to an E1/T1/PRI port. The S100 has room for 2 expansion modules and the S300 even has room for 3 expansion modules.

Available telephony modules

Supported Model: S20, S50, S100, S300, P550, P560, P570

S2 module

2 FXS Ports

Add 2 analog telephones.

O2 module

2 FXO Ports

Connect 2 analog PSTN (POTS) lines.

SO module

1 FXS Port & 1 FXO Port


Unique PSTN Fallback Function

B2 module

2 BRI Ports

2 x NT/TE BRI Ports

GSM module

1 GSM Channel

1 Channel for GSM Voice Calls Frequency: 850/900/1800/1900 MHz (quad-band)

4G LTE Module

3G/4G Voice Call & Data

Insert 4G module on Slot_1 of S20&S50 and Slot_1 of EXP 1 of S100&S300

Expansion module

With the EX08 module, the models S100, S300, P560 and P670 have the possibility to place telephony modules (4 pcs, 8 ports).

With the EX30 module, the S100, S300, P560 and P570 models have the ability to add an E1/T1/PRI port.

Expanding Capacity

The D30 adds 100 additional users and 30 simultaneous calls to the Yeastar S100, S300, P560 and P570.



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