The Yeastar S50 is ideal for the growing business, who requires an expandable and flexible system to cope with additional handsets and features. With up to 50 extensions and 25 concurrent calls, up to 8 card slots, supporting a combination of up to 16 analogue extensions or FxO ports, up to 4 3G trunks and a host of features, the S50 is the ideal compromise between flexibility and scalability.