Yeastar S20 - S-Series VoIP PBX | Yeastar

Yeastar S20 VoIP PBX

Advanced communication features to create effective business communication experience for small business, connecting to traditional lines, VoIP lines, and cellular networks

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phone users
  • 20 Users
  • 10 Concurrent Calls
  • Up to 4 FXS/FXO/BRI Ports
  • Up to 1 GSM/3G/4G Channel
pbx Security

Security : protected from Internet
hackers and viruses with built-in
firewall, TLS, SRTP, and more.


Performance : powered by
Freescale ARM A9 industrial grade
quad-core CPU processors.


Future-proof : free lifetime software
/firmware upgrade assures reliability
over the years.

Easy to use

Easy to use : save time with
streamlined installation. Manage
PBX on the intuitive web GUI.

Phone provisioning

Phone provisioning : automatically
provision phones from Cisco,
Yealink, Polycom, and more.

Flexible Modular Design

With Yeastar S-Series, all the telephony interfaces are modular and customizable, S20 support 2 onboard module slots to custom FXS, FXO, ISDN BRI, GSM/3G/4G.

S20 VoIP PBX Modular Design

B2 Module

B2 Module

O2 Module

02 module

SO Module

S0 module

S2 Module

S2 module

GSM Module

GSM module

3G Module

3G module

4G Module

4G module

Linkus Mobile Client.
Stay Connected anywhere anytime.

Coordinated with S-Series VoIP PBX, Linkus Mobile Client makes your Android or iOS mobile phone an office extension

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App center. Easy access to a wealth of PBX features.

app center for pbx
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Robust Feature Set for All of Your Calling Needs

The Yeastar S-Series is designed to help you grow your business by providing plenty business-enhancing
system features and functions. Learn more about the business-enhancing features.

Related S-Series Model

S50 voip pbx


Compact and full-featured
IP-PBX that support 50 users
and 25 Concurrent Calls.

S100 voip pbx


Cost-effective business phone
systems with up to 200 users
and 60 concurrent calls.

S300 voip pbx


Enterprise-class IP telephony
services that support scale up
to 500 users.



Flexible and modular VoIP PBX
with up to 12 FXS Extensions
and up to 4 CO/BRI lines.

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