Shenzhen Tangxin Technology Co., Ltd., built up in April, 2003, is a high-tech enterprise that is engaged in professional communications software product development, production, and sales. We have sprung up rapidly in the field of telecommunication by high professionalism and popular technology. Through years' unremitting efforts, we have put out the 'WS Charge Software', 'Tansonic PBX Charge Software', 'Tansonic Phone Recording System', 'Tansonic Mini Call Center system' and a series of ...