GRUU，全局路由用户代理用户资源标识，是VOLTE中用于标识用户及用户业务的。分为公共GRUU和临时GRUU，前者表示公共用户标识，后者只在IMS域注册状态下存在。
基本介绍
- 中文名：全局路由用户代理用户资源标识
- 外文名：GRUU
Globally Routable UA URI (GRUU):Several applications of the Session Initiation Protocol (SIP) require a user agent (UA) to construct and distribute a URI which can be used by anyone on the Internet to route a call to that specific UA instance. A URI which routes to a specific UA instance is called a Globally Routable UA URI (GRUU).