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.





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