会话初始化协议(SIP)是IETF提出的IP电话呼叫信令协议，是一个基于文本的协议，用来创建、修改和终止多媒体呼叫与会话。

SIP is proposed by IETF as IP phone call order protocol which is totally a text modality that to be used to establish, modify and terminate multimedia calls and conversation.

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格式选项初始化一个媒体设置。

Initialize a media set by using the FORMAT option.

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格式选项初始化一个媒体设置。

Initialize a media set by using the FORMAT option.

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