P2PSIP网络电话系统的研究与实现  

Research and implementation of softphone system based on P2PSIP

作　　者：谢瑾[1] 倪瑾[2] 

机构地区：[1]中南民族大学计算与实验中心,湖北武汉430074 [2]河南大学物理与电子学院,河南开封475000

出　　处：《计算机工程与设计》2010年第12期2901-2904,2908,共5页Computer Engineering and Design

基　　金：中南民族大学自然科学基金项目(YZQ07008)

摘　　要：针对传统SIP语音软件中心服务器负载过重,无法保证通话质量的问题,提出并研制了一个基于P2PSIP的网络电话系统。该系统采用Kademlia算法作为系统中P2P体系结构所使用的DHT算法,从而搭建重叠网。使用OSIP协议栈实现重叠网上的SIP数据包传输。利用NS2网络仿真器,对加入系统延迟、呼叫时延、等待通话次数以及服务器压力4个方面进行测试,并与基于C/S的SIP软件——xLite进行比较分析。实验结果表明,该系统具有良好的可扩展性,能有效地减少呼叫延迟,提高服务器效率,降低服务器压力。Aimed at the problem of central servers’ heavy load and unwarranted communication quality existing in traditional SIP audio software.The softphone system based on P2PSIP is proposed and implemented.The algorithm of Kademlia is selected at P2P in this system for constructing overlay.OSIP is used for transporting SIP data in the overlay.The performance of this system is tested at four aspects of joining delay,calling delay,waiting time and server pressure.Meanwhile this system is compared with the SIP software of xLite which based on C/S structure.Experiments show that the proposed system has the ability of excellent extensibility,decreasing calling delay,improving efficiency of servers and reducing the pressure of servers.

关 键 词：对等网 会话初始化协议 P2PSIP KADEMLIA 开放式会话初始化协议 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术]