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Yeastar S300 VoIP PBX supports up to 300 users and expandable to 500 users. Yeastar S300 features are 60 concurrent calls, 24 FXS/FXO/BRI ports, 3 E1/T1/PRI ports, 6 GSM/CDMA/3G/4G channels, security, performance, and future-proof, in short, it delivers enterprise-class IP telephony solutions. That's why it is great for small to medium businesses. By the...