本标准为IP网络上的紧急电信服务（ETS）提供了一套用户平面安全指南和要求。该范围旨在解决与ETS用户平面性能、可靠性和可用性相关的安全问题。ETS不包括E-911。

This standard provides a set of user plane security guidelines and requirements for Emergency Telecommunications Services (ETS) over IP networks. The scope is intended to address security as it relates to user plane performance, reliability, and availability of ETS. ETS does not include E-911.