H.323 VS SIP
时间：2006-07-07 来源：lzhw_lucky
H.323包括大量的ITU定义的视音频的协议并且打成rtp包传输出去，并且带有RTCP的控制协议。而SIP是IETF（internet Engineering Task Force）定义的，本身也支持RTP＋RTCP，唯一的不同的是how call signalling and control.(These functions are covered by the Session Initialtion Protocol).
Unlike call signalling and control protocols in the H.323 recommendation,SIP is a text based protocol. It resembles somewhat the Simple Mail Transfer Protocol(SMTP)and the Hypertext Transfer Protocol(HTTP),the protocols used to transfer e-mail and World Wide Web pages respectively！
SDP（session Description Protocol）
- 从复杂度来看，SIP远小于H.323。
- The specification of H.323 is more extensive than that of SIP and defines a lot more elements.Furthermore, H.323 uses a binary encoding mechanism for call signalling and control,whereas SIP is text based.This textual format is easy to decode and much easier to debug than a binary representation.
- A part of the complexity of H.323 stems from the interaction between several components which are not cleanly separated.Also, In H.323 there may be serveral ways to accomplish a single task and some of the functionality is present in several parts of the protocol.
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