Yeastar’s S-Series VoIP PBXs Features and Specifictations

his guide covers all models in the S-Series (S20, S50, S100, and S300), highlighting both hardware and software aspects to help you understand their capabilities and choose the right model for your business needs.

1. Overview of the Yeastar S-Series

The Yeastar S-Series is a line of IP PBXs designed for small to medium-sized businesses (SMBs), as well as larger enterprises. They offer:

• Scalability: Modular design and license-based expansions.
• Flexibility: Multiple telephony interface modules (FXO, FXS, BRI, GSM/3G/4G).
• Reliability: Stable Linux-based operating system and high-quality hardware.
• Feature-rich PBX Functions: VoIP, analog, and cellular connections, plus a wide range of UC (Unified Communications) features.

There are four models in the S-Series:

1. S20 — Designed for up to 20 users (ideal for micro/small offices).
2. S50 — Designed for up to 50 users (small/medium offices).
3. S100 — Designed for up to 100 users by default, expandable up to 200 users.
4. S300 — Designed for up to 300 users by default, expandable up to 500 users.

2. Hardware Specifications

2.1 Yeastar S20

• User Capacity: Up to 20 users.
• Concurrent Calls: Up to 10 concurrent calls.
• Expansion Slots: 2 onboard module slots.
• Interfaces:
  • 2 on-board RJ45 LAN ports (WAN/LAN or LAN/LAN).
  • 1 USB port.
  • 1 Reset button.
• Form Factor: Compact desktop device.
• Power Supply: DC 12V.

2.2 Yeastar S50

• User Capacity: Up to 50 users.
• Concurrent Calls: Up to 25 concurrent calls.
• Expansion Slots: 2 onboard module slots.
• Interfaces:
  • 2 on-board RJ45 LAN ports (WAN/LAN or LAN/LAN).
  • 1 USB port.
  • 1 Reset button.
• Mounting: Rack-mount or desktop.
• Power Supply: AC 100–240 V input, DC 12V output adapter.

2.3 Yeastar S100

• User Capacity:
  • Base: 100 users.
  • Expandable to 200 users with a license.
• Concurrent Calls:
  • Base: 30 concurrent calls.
  • Expandable to 60 concurrent calls with modules/licenses.
• Expansion Slots: 2 onboard module slots + 1 DSP module slot for VoIP channel expansion.
• Interfaces:
  • 2 on-board RJ45 LAN ports.
  • 1 USB port.
  • 1 Reset button.
• Mounting: 1U rack-mount.
• Power Supply: AC 100–240 V, built-in PSU.

2.4 Yeastar S300

• User Capacity:
  • Base: 300 users.
  • Expandable to 500 users with a license.
• Concurrent Calls:
  • Base: 60 concurrent calls.
  • Expandable to 120 concurrent calls (depending on modules/licenses).
• Expansion Slots: 3 onboard module slots + 1 DSP module slot.
• Interfaces:
  • 2 on-board RJ45 LAN ports.
  • 1 USB port.
  • 1 Reset button.
• Mounting: 1U rack-mount.
• Power Supply: AC 100–240 V, built-in PSU.

3. Module Options and Expansion

Yeastar S-Series PBXs support modular telephony interfaces. Common modules include:

1. EX08/EX30 Expansion Boards: Add module slots to S100/S300 for more telephony connections.
2. FXO Modules (O2): Each module supports 2 analog PSTN lines (FXO ports).
3. FXS Modules (S2): Each module supports 2 FXS ports for analog phones/fax machines.
4. BRI Modules (B2/B4): Supports 2 or 4 BRI ports (ISDN).
5. GSM/3G/4G Modules (GSM/3G/4G): Provide cellular connectivity for inbound/outbound calls and SMS.
6. DSP Expansion Module: Expands the maximum concurrent calls and VoIP channels.

Choosing Modules

• For analog trunks (traditional PSTN lines), choose O2 modules.
• For analog extensions (phones, fax machines), choose S2 modules.
• For ISDN connectivity, choose BRI modules (B2 or B4).
• For mobile connectivity or backup, choose GSM/3G/4G modules.

4. Key Software Features

All S-Series models share the same Yeastar firmware and software feature sets, including:

1. Call Handling Features
   • Call Transfer, Call Forward, Call Parking, Call Pickup, Call Waiting
   • IVR (Interactive Voice Response)
   • Auto Attendant
   • Call Recording (on-demand or automatic)
   • Ring Groups & Paging/Intercom
2. Mobility and Remote Working
   • Softphone support (Linkus UC Clients for mobile and desktop)
   • Remote extensions via STUN or SBC (Session Border Controller)
   • Web-based user portal
3. Collaboration Tools
   • Presence status (Available, Away, DND)
   • Instant Messaging and file sharing (via Linkus)
   • Audio/Video calls (depending on the endpoint support)
4. Unified Communications Features
   • Voicemail-to-email
   • Fax-to-email
   • Conference rooms & virtual meeting features
5. Security Features
   • TLS/SRTP encryption for VoIP traffic
   • IPS/IDS firewall protection
   • Blacklist/whitelist
   • Automatic fail2ban for brute force detection
6. Management & Administration
   • Intuitive web GUI (no CLI required)
   • Auto-provisioning for IP phones (Yealink, Fanvil, Snom, etc.)
   • System backup and restore
   • CDR (Call Detail Records) for call tracking and billing
   • Event Center for real-time alerts and notifications

5. Network Deployment Scenarios

5.1 Single-Site Deployment

• Scenario: Small office with up to 20 employees.
• Recommended Model: Yeastar S20 or S50.
• Configuration:
  1. Connect the S-Series PBX’s WAN port to the LAN switch/router.
  2. Optionally, add O2 modules for analog trunk lines or GSM modules for cellular fallback.
  3. Configure IP phones via auto-provisioning.

5.2 Multi-Site Deployment

• Scenario: Headquarters plus multiple branches.
• Recommended Model: Larger offices use S100 or S300, branch offices might use S20 or S50.
• Configuration:
  1. Interconnect PBXs over VPN or SIP Trunk (Yeastar supports “SIP Peer Trunk”).
  2. Set up extension dialing between sites (short codes, direct dial).
  3. Deploy Linkus UC clients for mobility between sites.

5.3 Hybrid Environment

• Scenario: Combining PSTN analog lines, ISDN, and VoIP trunks.
• Configuration:
  1. Populate S-Series with required FXO, FXS, BRI modules.
  2. Configure SIP trunking for cost-effective calls.
  3. Route calls strategically (least cost routing, fallback, failover).

6. Initial Setup and Configuration

1. Physical Installation
   • Rack-mount the PBX (for S50, S100, S300) or place the S20 on a flat surface.
   • Connect the power adapter/cable.
   • Connect the LAN port to your network switch/router.
2. Web Interface Access
   • Default IP address: Typically 192.168.5.150 (on the LAN port).
   • Connect your PC to the same LAN or directly to the PBX.
   • Open a web browser and enter the IP address.
   • Log in with the default credentials (as provided in the product manual) and change the password immediately.
3. Network Configuration
   • Navigate to System > Network.
   • Configure IP address (Static or DHCP).
   • Set your DNS, gateway, and VLAN if required.
4. Extension Setup
   • Go to Extensions > Add to create local SIP extensions.
   • Assign extension numbers, set passwords, configure voicemail, etc.
   • Configure advanced features like call forwarding, DND, etc.
5. Trunk Configuration
   • Analog/GSM/ISDN: Insert modules, then go to Line Settings in the web GUI.
   • SIP Trunk: Go to Trunks > VoIP Trunk and add credentials from your ITSP (Internet Telephony Service Provider).
   • Test inbound and outbound calls.
6. Inbound and Outbound Routes
   • Inbound Routes: Direct calls from trunks to IVR, ring groups, or specific extensions.
   • Outbound Routes: Define rules for local, mobile, or international calls (e.g., dial prefix “9” for outside lines).
7. Advanced Features (optional)
   • IVR: Set up call menus (e.g., “Press 1 for Sales, 2 for Support”).
   • Ring Groups or Call Queue: Distribute calls among teams.
   • Call Recording: Decide which extensions or inbound routes need recording.
   • Linkus UC Clients: Configure Linkus server settings so staff can use the softphone app.

7. Maintenance and Best Practices

1. Firmware Updates
   • Check for new firmware releases on Yeastar’s official website or from the PBX admin panel.
   • Keep the system updated to benefit from security patches and new features.
2. Regular Backups
   • Schedule regular automatic backups (daily/weekly) to an external server or local drive.
   • Store off-site backups in case of hardware failures.
3. Security Hardening
   • Use strong SIP passwords.
   • Enable the built-in firewall and set up IP address blacklists/whitelists.
   • Limit remote access or place the PBX behind a secure VPN.
4. Monitoring & Alerts
   • Configure SNMP or email alerts to monitor system status.
   • Check CDR logs to identify any unusual call patterns.
5. Scalability
   • Plan for future expansion. If you foresee user or call volume growth, choose an S100 or S300 with enough module slots and software licensing potential.

8. Model Comparison at a Glance

9. Conclusion

Yeastar’s S-Series PBXs (S20, S50, S100, and S300) deliver a robust, flexible, and scalable unified communications solution suitable for a wide range of business sizes and industries. With a straightforward web interface, extensive feature set, and modular architecture, you can tailor the system precisely to your telephony requirements—whether you’re integrating legacy analog lines, leveraging modern SIP trunks, or offering advanced UC tools for remote workers.

By following the setup steps above, maintaining best practices, and leveraging security features, you can ensure a stable, powerful PBX system that grows alongside your organization.

Helpful Resources

• Yeastar Official Website:
  https://www.yeastar.com
  (Documentation, firmware downloads, and user manuals)
• Yeastar Academy / Online Training:
  Yeastar offers training sessions and certification programs.
• User Manuals:
  Each S-Series model has a detailed hardware and software manual available for download on Yeastar’s support page.

By mastering the features and configuration options provided in this tutorial, you will be well-equipped to deploy, manage, and maintain any of the Yeastar S-Series PBXs effectively.

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