SIP 和 H.323 的区别
SIP和H.323有什么区别，我的意思是它们之间的显着特征是什么？ 首先，
- SIP 是基于文本的，而 H.323 是二进制的。
- SIP 由 IETF 制定，而 H.323 由 ITU 制定。
- SIP 基本上像 HTTP 一样基于请求-响应，而 H.323 则不然（基于会话）。
推动园区发展的动力是什么？
一个人与另一个人相比有何优势？
What is the difference between SIP and H.323, I mean what are the salient features between them?
To start with ,
- SIP is text based while H.323 is binary.
- SIP is by IETF while H.323 by ITU.
- SIP is basically request-response based like HTTP, while H.323 is not like that(is based on session).
What were the motivating factors which led to SIP's development?
How is one advantageous from other?
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两者在技术方面相对相同 - 存在差异，但您可以使用两者来运行 VoIP 服务。
它们几乎同时开始开发，H.323 在开始时获得了更大的关注，而 SIP 在过去几年中占据了中心舞台。
H.323 的主要优点是它在现有视频会议设备中提供的互操作性水平，这是目前 SIP 无法比拟的，而且它占据了企业中大部分视频会议的部署。
SIP 的主要优势是更大的生态系统以及在语音呼叫和 PBX 系统中的主导地位。事实上，它被视为 VoIP 的未来（至少在某种程度上）。
我过去也在我公司的博客中写过相关内容： http://blog.radvision.com/voipsurvivor/2011/03/24/ask-an-expert-which-protocol-do-you-prefer-sip-or-h323/
Both are relatively the same on the technical side - there are differences, but you can use both to run a VoIP service.
They both started at about the same time to develop, with H.323 gaining more traction in the beginning and SIP taking center stage in the past several years.
The main advantages of H.323 is the level of interoperability it provides in existing video conferencing equipment - something that can't be matched by SIP today (yet), and the fact that it holds most of the deployments of video conferencing in enterprises.
The main advantages of SIP is a larger ecosystem and dominance in voice calls and PBX systems. And the fact that it is viewed as the future of VoIP (at least to some extent).
I also wrote about it in the past in my company's blog: http://blog.radvision.com/voipsurvivor/2011/03/24/ask-an-expert-which-protocol-do-you-prefer-sip-or-h323/
H323对于电信人员来说很熟悉。它重用了 ISDN 中的许多概念、术语和协议。
SIP对于互联网人来说并不陌生。它很像 HTTP，重新使用所有响应代码和标准（例如 URI-s），很好地使用 DNS 等。
H323 is familiar to telecommunications people. It reuses many concepts, terms and protocols from ISDN.
SIP is familiar to internet people. It's a lot like HTTP, re-uses all the response codes and standards like URI-s, uses the DNS well, etc.