The SIP protocol is an important agreement used for IP phones in recent years.The refusal service attacks of DOS is a common attack which is difficult to prevent.According to the characteristics of SIP protocol,this paper introduces various kinds of DOS attacks and provides specific defense measures to enhance the security of SIP network.%SIP协议是近些年来用于IP电话的一个重要协议.DOS拒绝服务攻击,是一种常见并且难以防范的攻击方式.针对SIP协议的特点,介绍了多种DOS攻击方式,并给出具体的防御措施,增强了SIP网络的安全性.
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