如果您预计到将有来自其他时区的呼叫者，那么提供与时间相关的功能就是自找麻烦。

If you expect callers from outside your time zone, you're just asking for trouble by trying to provide a time-related feature.

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核心电话功能，如呼叫和文本信息的访问从主屏幕中，只要你一直固定在主网页上的相关图标。

Core phone functions like calling and text messaging are accessed from the Home screen, as long as you keep the relevant ICONS pinned to the main page.

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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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