About Yeastar Modules
Yeastar P-Series PBX System provides a flexible interface while allowing for future scalability with unique and customizable modular design. Besides the built-in rich SIP capabilities, you can also choose what types of extensions and physical trunks you need in your system, whether it’s FXS, FXO, ISDN BRI/PRI or GSM/3G/4G!
- All interfaces are modular and customizable
- FXS, FXO, ISDN BRI/PRI, or GSM/3G/4G.
- Flexible and scalable to grow with your business!

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Yeastar S2 Module 2 FXS
SKU: 02-123588
Yeastar S2 Module is a module with 2 FXS ports to terminate two analog telephone. S2 Module 2FXS is compatible with MyPBX series and S-Series PBX.$135.00 -
Yeastar O2 Module 2FXO
SKU: 02-115138
Yeastar O2 Module (2FXO) is a module with 2 FXO ports to terminate two analog PSTN(POTS) lines. The O2 Module 2FXO is compatible with MyPBX series and S-Series PBX.$135.00 -
Yeastar SO Module 1FXS and 1 FXO
SKU: 02-123587
Yeastar SO Module with 1FXO+1FXS. The Yeastar SO Module is compatible with MyPBX series and S-Series PBX and has a unique PSTN Fallback Function enabling you to make/receive calls even when system powers down.$146.00 -
Yeastar 1 GSM port module
SKU: 02-123586
Yeastar 1 GSM module is a module with 1 GSM channel that could call out by GSM. Yeastar 1 GSM is compatible with MyPBX and S-Series PBX.
$230.00 -
Yeastar WCDMA 3G Module WCDMA-A
SKU: 02-123585
Yeastar WCDMA 3G Module 1 WCDMA Trunk Compatible with S-Series and MyPBX U100/U200 only.$400.00 -
Yeastar YST-EX08 Expansion Module
SKU: 02-123589
Yeastar YST-EX08 Expansion Module with 8 RJ11 Ports.$84.00 -
Yeastar EX30 Expansion Span 1 E1/T1 PRI Port
SKU: 02-123488
Yeastar EX30 has 1 onboard E1/T1/PRI port and supported Model: S100 and S300.$717.00 -
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Yeastar LTE4G-EC25A S-series module for ATT or T-mobile
SKU: 02-131794
Yeastar LTE4G-EC25A S-series module for ATT or T-mobile$459.00 -
Yeastar 4G LTE Module EC25-A
SKU: 02-132904
The Yeastar 4G LTE Module provides full voice capabilities, high speed data transmission for S-Series VoIP PBX, supporting 3G/4G network standard, VoLTE*, and powerful SMS features.$459.00