SIP does not allocate multicast addresses and it does not reserve resources, but it can convey to the invited system the information necessary to do this.

sip不分配多波地址、也不保留资源，但它能把做到这点所必要的信息传递给被邀请的系统。

youdao

The fingerprint embedding is recently research key of information security in multicast environment.

多播环境下，指纹嵌入应用技术是目前信息安全研究的焦点。

youdao

There are many communication ways in space information network(SIN). The network topology changes dynamically, which brings out special requirements for multicast key management.

空间信息网络存在不同的通信方式，网络拓扑结构动态多变，对组播密钥管理提出了特殊的要求。

youdao