Yeastar S20 IP PBX is a stand-alone telephone system which is offering an unrivalled range of features too small business with less than 20 users. It supports ten concurrent calls and various combinations of telephony ports including FXS, PSTN, ISDN BRI, and GSM/3G.The S20 IP PBX both incredibly sophisticated and exceptionally simple to use.With  Yeastar  MyPBX S series you have a complete solution unmatched which has everything you need. Yeastar IP Telephone System give your company a competitive edge.The Yeastar MyPBX S20 expand your business profitably. And without multiplying costs.