Yeastar S20 - S-Series VoIP PBX for Small Business| Yeastar

Yeastar S20 VoIP PBX for Small Business

Compact all-in-one VoIP PBX with advanced telephony features to create effective business communication experience for small business.

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award-winning pbx system
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S20 voip pbx-front
S20 voip pbx-back
phone users
  • 20 Users
  • 10 Concurrent Calls
  • Up to 4 FXS/FXO/BRI Ports
  • Up to 1 GSM/3G/4G Channel
pbx Security

Protected from Internet hackers
and viruses with the built-in firewall,
TLS, SRTP, and more.


Powered by Freescale ARM A9
industrial grade quad-core
CPU processors.


Free lifetime 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 YealinkSnom, and more
to save deployment time.

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

FXS Module

FXS module

FXO Module

FXO module

PSTN Lifeline

PSTN Lifeline module

BRI Module

BRI Module

GSM Module

GSM module

3G Module

3G module

4G Module

4G module

Linkus Unified Communications App

Linkus is a unified communications app for Windows desktop, Mac desktop, iPhone and Android phones. Designed for Yeastar Cloud PBX and S-Series VoIP PBX, it transforms your desktop and mobile phone into a fully-featured office extension.

  • Available using Windows, macOS, iOS, and Android
  • Make and receive enterprise VoIP calls anywhere anytime
  • Outlook Contacts and Google Contacts integrated; more CRM to support
  • Instant messaging and file sharing empowered by Linkus Cloud Service
Learn More

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

app center for pbx
telephone system feature-bg

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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