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 products. These products have been widely used in Hotel, Service center, Finance, Electric power, Police, School, Hospital, Aviation, Railroad, Factory and some enterprises.In the course of development, our company has been working together with Shenzhen Cesller Company, and has put out the '3S Call Management Software', 'Group phone call management software', and 'HB Mini call center software', dedicated to the group telephone billing, programming and management. Applying ourselves to offer the phone system settle project for large, medium and small enterprises, and providing on-site installation, debugging, training and after-sales service, .Shenzhen Cesller Co. is one of the earliest manufacturer developing the Group phone PBX, and the Group phone products of HB have exceed the product level in domestic markets. In 1999, Cesller created the Chinese and English display program phone and 'Chinese Group phone' new concepts. Besides, Cesller also developed the China 'IP card group phone PBX' and 'FSK caller ID group phone PBX'.According to different enterprises' demands, Tangxin company has made the single configuration to multiplicity. At present, Tansonic Recording system has USB1 channel, USB2 channel, USB 4channel, PCI card 4 channel, 8 channel, 16channel (4 channel to 128 channel), embedded 8 channel, 16 channel, and digital E1 card. The software version is divided into