Key Differences Between Yeastar’s S-Series and P-Series IP PBX system

1. Overview

Yeastar S-Series

• Released: Prior to the P-Series, the S-Series has been Yeastar’s proven VoIP PBX solution for SMBs and mid-market users.
• Positioning: Focuses on traditional telephony (analog, digital, SIP) with essential UC features like Linkus (voice, some chat features).
• Models: S20, S50, S100, and S300.

Yeastar P-Series

• Released: As Yeastar’s next-generation unified communications platform.
• Positioning: Goes beyond voice to offer modern UC features (video conferencing, advanced collaboration, contact center).
• Models (Appliance Edition): P520, P550, P560, P570.
  (Also available as Software Edition and Cloud Edition, which S-Series does not offer.)

2. Key Differentiators at a Glance

3. Hardware & Capacity Differences

S-Series Hardware

1. Models: S20 (up to 20 users), S50 (50 users), S100 (up to 200 users), S300 (up to 500 users).
2. Expansion Slots: 2–3 module slots.
3. Concurrent Calls: Scales from 10 (S20) up to 120 (S300 with DSP module).
4. Form Factor: Desktop (S20, S50) or 1U rack-mount (S100, S300).

P-Series Hardware (Appliance Edition)

1. Models:
   • P520: 20 users (fixed), 10 concurrent calls.
   • P550: 50 users (fixed), 25 concurrent calls.
   • P560: 100 users (base), up to 200 with license, 30–60 concurrent calls.
   • P570: 300 users (base), up to 500 with license, 60–120 concurrent calls.
2. Expansion Slots: 1–3 module slots (depending on model).
3. Features: All P-Series appliances are designed for UC and have built-in collaboration tools.
4. Form Factor: 1U rack-mount (though smaller models can be placed on a desktop).

Key Takeaway:

• S-Series is primarily for standard telephony requirements, and each model’s capacity is expanded using module slots and licenses.
• P-Series offers similar scaling but is architected to handle advanced UC features out of the box.

4. Software & UC Features

4.1 Unified Communications

S-Series:

• Offers Linkus softphone for mobile/desktop (basic functionality: voice calls, limited chat).
• No native video conferencing — typically requires external platforms.
• CRM integration is more manual, limited out-of-the-box options.

P-Series:

• Video Conferencing: Built-in WebRTC solution with screen sharing, chat, conference management.
• Full-featured Linkus UC Clients: Chat, presence, file sharing, group messaging.
• Operator Panel: Graphical real-time call and queue management (drag-and-drop transfers).
• CRM Integration: Native connectors for Salesforce, Zoho, and other popular CRMs for screen pops, contact sync, call journaling.

4.2 Advanced Call Center Functions

S-Series:

• Basic queue features (ring strategy, announcements, hold music).
• Basic agent & queue monitoring (through CDR or simple real-time views).
• Limited reporting — typically you rely on third-party analytics or manual exports.

P-Series:

• Advanced Queue Strategies: More ring options, agent wrap-up time, queue callback.
• Real-time Wallboards: Monitor agents, call volume, wait times in real-time.
• Detailed Reports & SLA: Agent performance, abandoned calls, queue SLAs, etc.
• Call Center Supervision: Barge, whisper, and monitor for agent calls.

4.3 Management & Security

Both series share some commonalities:

• Web-based configuration.
• Firewall, fail2ban (intrusion detection).
• TLS/SRTP encryption support.

However, the P-Series has enhanced security modules, a more modern admin UI, and a built-in platform for real-time system alerts and event logs, making it more user-friendly for administrators.

5. Deployment & Scalability

5.1 S-Series Typical Use Cases

1. Small to Medium Offices: Up to a few hundred users who primarily need voice calling with occasional use of analog lines or GSM fallback.
2. Cost-Sensitive Deployments: Where advanced UC features (video, CRM integration) are not a high priority, or if you plan to use separate platforms for conferencing and collaboration.
3. Legacy Environment: Businesses wanting a stable, time-tested PBX with basic UC features.

5.2 P-Series Typical Use Cases

1. SMBs to Large Enterprises: Who require robust UC (voice, video, IM, presence), advanced call center features, and CRM integration all in one solution.
2. Remote/Hybrid Work: Users who demand full collaboration tools like video conferencing, screen sharing, and team messaging.
3. Future Growth: Companies expecting to expand their user base or call center operations and want a modern platform that can scale quickly (up to 500 users on a single appliance).
4. Multiple Deployment Methods: P-Series is also available in Software and Cloud editions, allowing for flexible hosting or virtualization — something the S-Series does not offer out of the box.

6. Migration Considerations

If you currently have an S-Series and are contemplating a P-Series upgrade, here are key points:

1. Software Feature Gap: The P-Series has built-in video conferencing and an updated Linkus UC experience that the S-Series lacks.
2. CRM & Call Center: If you need advanced CRM integration and sophisticated contact center capabilities, P-Series is a big step up.
3. Hardware Modules: You can often reuse certain FXO/FXS/BRI/GSM modules when moving from S-Series to P-Series, but confirm module compatibility and check with Yeastar or your reseller.
4. Configuration Migration: Yeastar provides tools or manual procedures to port extensions, trunks, etc. Although not always 1-click, it can significantly reduce re-configuration time.
5. Budget: P-Series appliances and licenses might be higher in cost but provide much deeper UC and contact center features.

7. Summary of Key Differences

1. UC & Collaboration:
   • S-Series: Basic UC features
   • P-Series: Comprehensive UC suite (video, messaging, presence, advanced Linkus)
2. Call Center:
   • S-Series: Essential queue functionality
   • P-Series: Professional call center capabilities (wallboard, reporting, monitoring)
3. Integration:
   • S-Series: API or limited built-in
   • P-Series: Native CRM connectors and broader API options
4. Deployment Options:
   • S-Series: Appliance-based only
   • P-Series: Appliance, Software (VM), or Cloud
5. Future-Proofing:
   • S-Series: Excellent for standard telephony, smaller scale UC
   • P-Series: Designed for modern, integrated collaboration, and contact center demands

8. Which Series Is Right for You?

Choose S-Series if:

• You primarily need voice and basic UC (audio calls, voicemail, a simple softphone).
• You have smaller call center requirements or rely on third-party solutions for advanced features.
• You have a stable on-prem environment and want a proven, cost-effective PBX.

Choose P-Series if:

• You demand a full UC experience (video conferencing, chat, presence, operator panel).
• You plan to run or grow a professional call/contact center with real-time monitoring.
• You want direct CRM integration and out-of-the-box advanced reports and collaboration tools.
• You’re open to software/cloud-based deployments or want an appliance that can scale up to 500 users easily.

9. Conclusion

Yeastar’s S-Series was a groundbreaking, feature-rich IP PBX that brought robust telephony to SMBs in a cost-effective manner. Yeastar’s P-Series, however, takes communication a step further with built-in video collaboration, advanced call center capabilities, and deeper integrations.

• If you only need reliable phone system features and some light UC (basic chat, mobility with Linkus), the S-Series may suffice.
• If your business demands a modern, fully integrated UC environment with video, advanced reporting, and contact center capabilities, the P-Series is a better fit.

By evaluating your organization’s communication style, future growth plans, and budget, you can decide which Yeastar system aligns best with your needs. Both series share the same DNA of reliability and quality — it’s simply a matter of how deep you want your UC and call center experience to be.

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