该模型利用事件通告机制来传送双音多频信号，通过SUBSCRIBE和NOTIFY两个消息来实现交换机对SIP终端的完全控制。
This model offers SIP Specific Event Notification to transmit DTMF, and USES SUBSCRIBE and NOTIFY to realize the control to IP phone.
一天，楚厉王通告老百姓：假如国家发生急事，就以击鼓为信号。
One day, King Li of the State of Chu announced to the people: If any emergency occurs in our country, the drum will be beaten as a signal.
一天，楚厉王通告老百姓：假如国家发生急事，就以击鼓为信号。
One day, King Li of the State of Chu announced to the people: If any emergency occurs in our country, the drum will be beaten as a signal.
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