IP话费管理是电信计费系统必备的重要功能模块，主要负责对各种标准的话费进行计算和管理，对通话记录进行添加、修改、查询。本课题以中国电信企业IP话费管理模块作为原型参照，要求对文件存储的用户资料与话单记录数据进行计算、显示、增加、修改等操作。通过此可以熟练掌握文件读写、函数调用等知识及查找算法、话费计算方法的设计与应用。-IP calls management is an important telecommunications billing system must function modules, is responsible for all standard calls for the calculation and management of call records to add, modify, query. The topics to IP calls China' s telecommunications industry as a prototype reference management module, requiring users to information stored on the file and then single-record data to calculate, display, add, modify, and other operations. With this you can master reading and writing files, function calls and other knowledge and the search algorithm, calls the design and application of calculation methods.