Shenzhen Cesller Technology Co., Ltd., founded in 1996, is one of the largest manufacturers of professional group phone system in China. Early in 1992, our company together with other competitors developed EC9315 Mini-PBX which causes a great stir in China. We also are the first manufacturer in developing the first mainstream Group Phone System products and Digital Key Phone in China. After several years of hard work, Cesller has continued to develop from small to large. Today we have a complete set of Group Phone Systems with 18 types from "2 CO lines 8 Ext" to "120 CO lines...