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Yeastar PABX S20


Technical Specifications: Yeastar S20

Feature Specification
Users / Extensions 20
Max Concurrent Calls 10
Max Analog Ports (FXS/FXO) 4 (Using O2/S2/SO Modules)
Max BRI Ports 2
Max GSM/3G/4G Ports 1
Ethernet Interfaces 2 x 10/100 Mbps (LAN/WAN)
Protocol Support SIP (RFC3261), IAX2
Storage 1 x TF (MicroSD) Card Slot (For Recording/Logs)
Power Supply DC 12V, 1A
Dimensions 160 x 160 x 30 mm

Ideal For:

  • Small Businesses (1–20 Staff): The perfect professional upgrade for law firms, accounting offices, and consultancies looking to move away from basic landlines.

  • Retail Stores & Boutiques: Connect your shop-floor cordless phones and a back-office desk phone to a single, smart system.

  • Home Offices: Ideal for professionals who want a dedicated business line with professional greetings and “after-hours” automated responses.

  • Branch Offices: Connect small remote branches back to a main headquarters via a secure SIP tunnel for free inter-office calling.


The Yeastar S20 is a stand-alone, industrial-grade VoIP PBX designed for small businesses and home offices that require a professional phone system without the enterprise price tag. Supporting up to 20 users and 10 concurrent calls, the S20 is built on the rock-solid S-Series platform, known for its “set-and-forget” reliability. With its unique modular design, the S20 allows you to mix and match hardware interfaces—integrating analog lines, digital extensions, and mobile trunks into a single, unified communication hub.

Features two onboard module slots. Customize your system by adding O2 (FXO), S2 (FXS), SO (FXS/FXO), BRI, or GSM/3G/4G modules to suit your specific connectivity needs.

Includes professional features at no extra cost: Auto-Attendant (IVR), Call Recording, Voicemail-to-Email, Call Queues, Intercom/Paging, and Music on Hold.

The fanless, low-power design ensures silent operation, making it perfect for small offices or retail environments where a noisy server rack isn’t an option.

SKU: S20 Categories: , Tags: , , Brand:

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