IMS网络中合法监听的实现方法

Implementation of Lawful Interception Within IMS

合法监听是指安全机构出于执法的需要,对某个用户或某个通信过程进行监听,它是电信运营过程中必须提供的功能。ETSI、3GPP等标准组织一直在制定合法监听的相关标准,目前在用户接口和网络接口方面也已经形成相应标准,并且能指导具体的实施。IMS是在3GPP Release5之后新提出的核心网架构,它具有分层设计,以IP为基础,以SIP为主要通信协议。IMS中有两种典型的实现合法监听的方法——分布式和集中式。

Lawful interception is a system which monitors a user or a communication in the support of criminal investigation. It is a necessary function of the telecommunication operator. The telecommunication standards bodies such as ETSI, 3GPP are producing technical specifications on lawful interception system, and have developed standards on handover areas and interception areas which can guide the implement. IP Multimedia Subsystem （IMS） is a new core-network architecture introduced after the version of 3GPP Release 5, which is layer-designed, IP-based, and using Session Initiation Protocol （SIP） as application protocol. There are two typical implementations of lawful interception within IMS, distributed type and centralized type.