基于标准的RTSP协议被用于信令所使用的播放器（和服务器）。
The standards based RTSP protocol is used by the player (and server) for signalling.
RTSP协议覆盖信令等领域，比如请求所需的电影编解码器的细节，通道数目，源服务器的IP地址和端口发送流。
RTSP protocol covers signalling areas such as requesting the details of the movie codecs required, number of tracks, source IP addresses and ports of the server sending the stream.
本文首先简单介绍了VOD视频点播的原理，然后给出了一种具体的服务器的设计方案，其中详细分析了系统控制、信令功能及播放控制部分。
This paper first briefly introduces VOD's principle and application, then presents a design of VOD server software, and particularly analyzes the system control, signaling and play control.
软交换涉及的产品主要有负责核心控制的软交换设备、应用服务器、媒体服务器、接入网关、中继网关、信令网关、IAD设备。
Products softswitch involves mainly include: softswitch equipment for core control, application server, media server, access gateway, relay gateway, signaling gateway, and IAD equipment.
承载面承载媒体与信令流，信令面完成各种控制功能，应用面是媒体资源服务器。
Bearing plane bears media and signaling traffic, and signaling plane completes all control functions, and application plane means media or resource servers.
承载面承载媒体与信令流，信令面完成各种控制功能，应用面是媒体资源服务器。
Bearing plane bears media and signaling traffic, and signaling plane completes all control functions, and application plane means media or resource servers.
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