From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: SDP
+slug: Glossary/SDP
+translation_of: Glossary/SDP
+---
+<p><strong>SDP </strong>(Session Description {{glossary("Protocol")}}) 是一个描述{{Glossary("P2P","peer-to-peer")}} 连接的标准. SDP包含音视频的:编解码({{Glossary("codec")}}),源地址,和时间信息.</p>
+
+<p>下面是一个典型的SDP信息示例:</p>
+
+<pre>   v=0
+   o=alice 2890844526 2890844526 IN IP4 host.anywhere.com
+   s=
+   c=IN IP4 host.anywhere.com
+   t=0 0
+   m=audio 49170 RTP/AVP 0
+   a=rtpmap:0 PCMU/8000
+   m=video 51372 RTP/AVP 31
+   a=rtpmap:31 H261/90000
+   m=video 53000 RTP/AVP 32
+   a=rtpmap:32 MPV/90000</pre>
+
+<p><br>
+ SDP协议从不会被单独使用,而是依靠 {{Glossary("RTP")}} 和{{Glossary("RTSP")}}等协议.SDP也作为{{Glossary("WebRTC")}}的组件之一,用于描述一个session会话.</p>
+
+<h2 id="了解更多">了解更多</h2>
+
+<h3 id="General_knowledge">General knowledge</h3>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/WebRTC_API/Architecture/Protocols">WebRTC protocols</a></li>
+ <li>{{Interwiki("wikipedia", "Session Description Protocol")}} on Wikipedia</li>
+</ul>
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