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Yeastar specializes in the design and development of innovative telecommunications equipment, including VoIP PBX systems and VoIP gateways for the SMB.

Yeastar S-Series IP PBX

Trusted for 13 years by over 200,000 customers, Yeastar PBX Phone Systems put all the ways you need to communicate in one place, enabling you to connect with your team with all-inclusive features, at a lighting fast pace.

Performance and Power

Easy to use, reliable, and feature-rich, S-Series is designed to help small and medium businesses make a giant leap in efficiency and cost savings. The innovative S-Series unleashes the power of unified communications, provides great flexibility with field-upgradable modular design, and allows you to connect to traditional lines, VoIP lines, and cellular networks. Perfectly future-proof, S-Series converges business-enhancing features with free software updates to grow with your business and assures reliability over the years.

Appreciate the Easy-to-use Solution
The S-Series features fast installation with comprehensive auto provisioning, advanced plug and play capability, together with an intuitive Metro UI driven by point-and-click configuration, from any location.

Your Choice of Technologies and Features
With a unique modular design, the S-Series will install into the most demanding of environments. You can also take advantage of advanced enterprise-grade features with the fullest and most complete software versions.

Telephone System without Risk
S-Series is built with the future in mind, utilizing the latest technology advances, from Freescale industrial grade Quad Core processors, TI DSP voice processors, and long-life power units and lightning protection.

Play Safe and Expect Reliability
With advanced failover, security, monitoring and reporting capabilities as standard, combined with an internal firewall and with support for TLS and SRTP encryption, there has never been such a robust system.

Key Features and Benefits

  • Linkus Unified Communications App for Desktop and Mobile 

  • Works with SIP/IAX2, PSTN lines, ISDN BRI, E1/T1/PRI, and GSM/3G/4G 

  • Built-in call recording capability 

  • Powerful Apps (add-ons) include Linkus Server, Auto Provision, LDAP, Conference Panel, VPN Server, Billing App, Hotel App, and more 

  • Control and manage customer premises PBX easily and quickly with Remote Management 

  • Convenient integration with the call centre, PMS, and CRM 

  • Connect multiple sites and remote users instantly 

  • No hidden charges and extra licensing fees 

  • Low power consumption (1.8-59.1 watt)



Support 20 Users 10 Concurrent Calls



Support 50 Users 25 Concurrent Calls



Support 200 Users 60 Concurrent Calls



Support 500 Users 120 Concurrent Calls


  • Automated Attendant (IVR) 
  • Attended Transfer 
  • AutoCLIP 
  • Blind Transfer 
  • Blacklist/Whitelist
  • Call Back 
  • Call Detail Records (CDR) 
  • Call Forwarding 
  • Call Monitor 
  • Call Parking 
  • Call Pickup 
  • Call Recording 
  • Call Routing 
  • Call Waiting (FXS) 
  • Caller ID 
  • Conference
  • Custom Prompt 
  • Dial by Name
  • DISA 
  • Distinctive Ringtone
  • DNIS 
  • Do Not Disturb (DND) 
  • Event Center 
  • Email to SMS/SMS to Email 
  • Fax to Email 
  • Paging/Intercom 
  • LDAP 
  • Linkus UC Softphone 
  • Mobility Extension 
  • Multi-language System Prompt 
  • Multi-language Web GUI 
  • Multisite Interconnect
  • Music on Hold 
  • One-Touch Recording 
  • Queue 
  • PIN List 
  • Phone Provisioning
  • Real-time Status Monitor 
  • Remote Management 
  • Ring Group 
  • SIP Forking 
  • SLA
  • Speed Dial 
  • Time Condition 
  • User Portal 
  • User Permission 
  • Video Calls 
  • Voicemail
S20 S50 S100 S300
Users  20 50 100(Upto 200) 300(Upto 500)
Max Concurrent Calls 10  25 30 (up to 60) 60 (up to 120*) 
Max FXS Ports  4 16 24
Max FXO/BRI Ports  4 8 16 24
Max GSM/3G/4G Ports   1 4 6 6
Max 4G Port (Data)  1 1 1 1
Max E1/T1/J1 Ports   - - 2 3
VoIP Trunks  20 50 100 100
Protocol  SIP (RFC3261), IAX2
Transport Protocol UDP, TCP, TLS, SRTP
Codec G711 (alaw/ulaw), G722, G726, G729A, GSM, Speex, ADPCM, iLBC, H263, H263P, H264, MPEG4
DTMF In-band, RFC4733, RFC2833, SIP INFO
Ethernet Interfaces 2 × 10/100 Mbps 2 × 10/100/1000 Mbps
IP Services Static IP, DHCP, VPN, Firewall, VLAN, DDNS, PPPoE, QoS, Static NAT, STUN
Voicemail 5000 min (expandable) 10000 min (expandable)
Firewall Yes Yes Yes Yes
T.38 Fax Yes Yes Yes Yes
Hot Standby Yes Yes Yes Yes
App Center Linkus Unified Communications App, Phone Provisioning, LDAP Server, Conference Panel, VPN Server, Billing App, Hotel App, char utile h+ Integration, QueueMetrics Integration
External Storage TF Card SD Card SD Card SD Card & 2.5’’ SATA HDD
USB - - 1 1
Power DC 12V 1A AC 100-240V 50/60HZ 0.6A max AC 100-240V 50/60HZ 1.8A max
Size (L x W x H) (cm) 16 x 16 x 3 34 x 21 x 4.4  44 x 25.2 x 4.4  44 x 25.2 x 4.4 
Weight 0.3 kg  1.48 kg  2.5 kg  2.6 kg
Power Consumption 1.8-10.6 W  2.1-18.5 W  5.5-41.2 W  6.2-59.1 W
Environment Operation Range: 0°C to 40°C, 32°F to 104°F; Storage Range: -20°C to 65°C, -4°F to 149°F; Humidity: 10-90% non-condensing
Mounting Desktop & Wall-mount 1U Rack-mount

Yeastar VoIP Gateways bridge the gap between FXS, FXO, PRI, BRI, GSM, WCDMA, 4G LTE, and IP networks to reduce operating costs and deliver the convenience of traditional telephony circuits to a wide range of manufacturer VoIP phone systems including Yeastar.

TG Series VoIP GSM Gateway

TG Series VoIP GSM Gateway

TA Series FXS VoIP Gateway

TA Series FXS VoIP Gateway

TA Series FXO VoIP Gateway

TA Series FXO VoIP Gateway

TE Series E1/T1/PRI VoIP Gateway

TE Series E1/T1/PRI VoIP Gateway

Yeastar Linkus

Unified Communications App

  • Available for Microsoft Windows, macOS, iOS, and Android.
  • Make and receive enterprise VoIP calls over your Wi-Fi or mobile data networks to cut mobile voice charges.
  • Quickly collaborate with your colleagues with personal chat, group chat, and file sharing.
  • See who is available, offline, away, on a call, do-not-disturb, in a break or trip immediately. You can also customize the availability status description.
  • Secure instant messaging with proprietary binary protocol and encrypted communications with TLS/SRTP.
  • One number reach to conceal your mobile phone number and ensure a unified corporate identity.
  • Ad-hoc Conference on Mobile Client: start an instant meeting with as many as 8 people.
  • Call popup and call journals to come with Outlook Contacts and Google Contacts integration on Linkus Desktop Client.

Get Yeastar Linkus for Your Devices

Linkus for
Turn your Android smartphone to your office extension.

Linkus for
Take your company call on the go on your iPhone.

Linkus for
Enjoy the unified communications app at your desktop.
Linkus for

Bring unified communications to you Mac desktop.

Concept and Design by Blue Lynx

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