可视电话系统中多点通讯服务的设计与实现

Design and Implementation of Multipoint Communication Services for Video Photo

介绍了可视电话系统中多点通讯服务的设计与实现方法。所采用的多点通讯机制基于多点通讯服务协议MCS（T．122／T．125）。文章首先介绍了MCS的基本功能单元，在此基础上介绍了基本功能单元的数据结构实现，以及MCS实体工作时的两个基本线程——系统监听线程和用户调用线程的数据处理流程。

： Design and implementation methods of multipoint communication services for video photo have been introduced in this paper.The mechanism of multipoint communication services adapted in this paper is based on the MCS protocols（T．122／T．125）．The basic function units have been introduced at first，and then the data structures is implemented for these units.The data flows of the two working threads（system listen thread and user call thread） for the MCS are analyzed finally．