Assuming the use of a protocol like SDP, the two clients have negotiated a successful session with one another to communicate over another protocol.
通过使用sdp之类的协议，两个客户机彼此协商了一个成功的会话，以在另一个协议上进行通信。
SDP is not really a protocol, but rather a message syntax that can describe another protocol connection.
SDP并不是一个协议，而是可以描述另一个协议连接的消息语法。
For example, in voice connections of applications such as IP telephony, the protocol negotiated with SDP in a SIP message is often Real-Time protocol (RTP), which is defined in RFC 3550.
例如，在ip电话等语音应用程序连接中，在SIP消息中使用SDP协商的协议通常是实时协议(Real - Time Protocol, RTP)，而此协议在RFC 3550中定义。
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