Yeastar S412 VoIP PBX

Hybrid VoIP.
Engineered for Small Business

Unifying the advanced VoIP technology with robust analog capacity, Yeastar S412 provides a future-ready solution that delivers exceptional productivity and cost-savings.

  1. 8 VoIP Users
  2. 8 Concurrent Calls
  3. Up to 12 FXS Ports
  4. Up to 4 FXO/BRI Ports
  5. Up to 2 GSM/3G/4G Channels



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All-in-one analog and VoIP capable phone system. Perfect for start-ups and small business.

Yeastar Awards:


Simple to use and manage

Easy to use with plug-and-play, phone auto provisioning, and intuitive GUI.

Full-Featured + Robust UC

Connect and collaborate any way, on any device with complete feature set.

Remote management

Reduce IT & maintenance costs with highly-secure remote monitor and control.

Reliability over year

Free lifetime software upgrade plus high-end security to assure reliability over year

Connect, communicate and collaborate the way you like

With S412 to work with Yeastar Linkus UC softphone and Linkus Cloud Service, experience the ultimate convenience of doing business anywhere, on any device


Eliminate complexity and connect on any device anywhere with Linkus UC Softphone


Voice, conferencing, messaging. Get all advanced features for smarter conversations.


Corporate Directory. Presence. File Sharing. It’s about the team-up.

CRM Integration

Salesforce CRM, Microsoft Dynamics 365,Outlook Contacts, Google Contacts…

Flexible Modular Design

Free Telephony Interfaces Combination
S412 VoIP PBX is pre-configured with 8 fixed FXS ports and is customizable with 4 module slots, which brings you flexible combination of FXS, FXO, BRI and GSM/3G/4G interfaces.

  • 2 module slots for internal extensions (S2 Module only)
  • 2 module slots for external lines (O2/BRI/GSM/3G/4G Module only)

Powerful Remote Management

Benefit from a highly secure platform to monitor and manage your PBX system(s) remotely and centrally. Whether you are a phone system end user or a IT reseller, Yeastar Remote Management tool is here to free you from technical headaches and reduce IT & maintenance costs.

Robust Feature Set Crafted for Your Business Needs

Complete Built-in Features

From basic call routing, IVR to advanced call conferencing and recording, Yeastar S-Series VoIP PBX provides you with all-inclusive features without extra licensing fees.

Extra Capacity with App Center

Independent from the main framework of the system, App Center allows you to add and manage Apps independently for extra functionality like hotel app, billing, call center integration, etc.

Supported IP Phones

Yeastar S-Series support auto provisioning with numerous SIP/IP phone brands and models.

4G LTE Solution

SIP over 4G LTE. Ideal for temporary locations, mobile offices, and more.

Branch Office Solution

Interconnect multisite with ease and benefit from free and seamless inter-office communications.

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, VPNServer, Billing App, Hotel App, and more coming soon
  • Control and manage customer-premises PBX easily and quickly with Remote Management
  • Convenient integration with call center, 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)


  1. Automated Attendant (IVR)
  2. Attended Transfer
  3. AutoCLIP
  4. Blind Transfer
  5. Blacklist/Whitelist
  6. Call Back
  7. Call Detail Records (CDR)
  8. Call Forwarding
  9. Call Monitor
  10. Call Parking
  11. Call Pickup
  12. Call Recording
  13. Call Routing
  14. Call Waiting (FXS)
  15. Caller ID
  16. Conference
  17. Custom Prompt
  18. Dial by Name
  19. DISA
  20. Distinctive Ringtone
  21. DNIS
  22. Do Not Disturb (DND)
  23. Event Center
  24. Email to SMS/SMS to Email
  25. Fax to Email
  26. Paging/Intercom
  27. LDAP
  28. Linkus UC Softphone
  29. Mobility Extension
  30. Multi-language System Prompt
  31. Multi-language Web GUI
  32. Multi-site Interconnect
  33. Music on Hold
  34. One Touch Recording
  35. Queue
  36. PIN List
  37. Phone Provisioning
  38. Real-time Status Monitor
  39. Remote Management
  40. Ring Group
  41. SIP Forking
  42. SLA
  43. Speed Dial
  44. Time Condition
  45. User Portal
  46. User Permission
  47. Video Calls
  48. Voicemail
S412 S20 S50 S100 S300
Users 20 20 50 100 (up to 200) 300 (up to 500)
Max Concurrent Calls 8 10 25 30 (up to 60) 60 (up to 120*)
Max FXS Ports 12 4 8 16 24
Max FXO/BRI Ports 4 4 8 16 24
Max GSM/3G/4G Ports 2 1 4 6 6
Max 4G Port (Data) 1 1 1 1 1
Max E1/T1/J1 Ports 2 3
VoIP Trunks 4 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 yes
T.38 Fax Yes Yes Yes Yes Yes
Hot Standby Yes Yes Yes Yes Yes
App Center Linkus Mobile Client, Phone Provisioning, LDAP Server, Conference Panel, VPN Server, Billing App, Hotel App, charutile h+ Integration, QueueMetrics Integration
External Storage TF Card  TF Card  SD Card SD Card  SD Card & 2.5’’ SATA HDD
USB 1 1
Power DC 12V 3.33A 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) 29 x 18 x 3.3 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 0.68 kg 0.3 kg 1.48 kg 2.5 kg  2.6 kg
Power Consumption  9.0-25.6W 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


Additional information

Weight 0.68 kg
Dimensions 29 × 18 × 3.3 cm


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