说明：  Real-Time Protocol: RTP 是一个打包协议，和UDP（User Datagram Protocol）联合使用,可以用来在使用IP（Internet Protocol）协议的网络上传输实时多媒体数据。
(Real-Time Protocol: RTP is a package agreement, and UDP (User Datagram Protocol) joint use, can be used in the use of IP (Internet Protocol) network protocol in real-time multimedia data transmission.)