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目前各标准化组织对在IP网络上承载实时业务采用的方案均相同，都是采用IETF的RTP协议，但是在呼叫建立和控制方面则有着不同的方案，有IETF的SIP协议、ITU－T的H323协议和IETF的MGCP协议。它们是关系到IP电话质量好坏的核心协议。本文分别介绍这三种协议，并进行比较。SIP协议
At present, each standardization organization adopts the same scheme for carrying real-time services on an IP network. Both adopt the IETF RTP protocol but have different schemes in call establishment and control. There are IETF SIP protocols, ITU-T H323 Protocol and IETF’s MGCP protocol. They are the core protocols that affect the quality of IP telephony. This article describes each of these three protocols and compares them. SIP protocol