从IP电话的协议栈出发，介绍了SIP的功能特点、地址格式、呼叫及响应方式、SIP组件以及相关协议。
The function, address format, the mode of call request and response, SIP module and correlative protocol are introduced.
从IP电话的协议栈出发，介绍了SIP的功能特点、地址格式、呼叫及响应方式、SIP组件以及相关协议。
The function, address format, the mode of call request and response, SIP module and correlative protocol are introduced.
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