本文在分析SIP 协议的基础上,设计了一种分布式VOIP 系统的侦听模型,并对其数据库备份的问题和侦听的身份认证问题进行了探讨。 关键字: SIP; VOIP; 侦听 Abstract: This article designed a distributional VOIP system model of intercept based on analyzing the SIP protocal , and discussed the question of database backup and intercepts warningpower. Keywords SIP; VOIP; intercept