iOS 4：通话期间是否可以显示本地通知？
我想要一个应用程序在后台运行并侦听指示已启动电话呼叫的事件（通过使用 CTCallCenter）。根据这些数据，我想注册指示通话持续时间的本地通知。是否可以：
A：在后台监听电话事件？如何防止应用程序被暂停（Apple 文档规定，应用程序暂停时不会收到事件）
B：在此日期注册本地通知并在通话期间显示这些通知（或者框架是否在通话期间限制本地通知？我找不到任何相关信息）
非常感谢您的帮助。
I want an app run in the background and listen to the events that indicate initiated Telephony Calls (by using CTCallCenter). Upon this data, I want to register Local Notifications that indicate call duration. Is it possible to:
A: Listen to Telephony events in the background? How to keep the app from being suspended (Apple documentation states that events are not received while app is suspended)
B: Register Local Notifications upon this date and SHOW these notification DURING a call (or does the framework restrict Local Notifications during phone calls? I can't find any info on this)
Help would be very much appreciated.
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答：有点...如果您有活动的后台任务，您可以获得呼叫状态事件。坏消息是后台任务只会持续 10 分钟。因此，10 分钟后，您将不会再收到任何呼叫状态。
B：是的，通话时本地通知确实有效。我已经做到了并且效果很好。
A: kind of... you can get call state events IF you have a background task active. The bad news is that the background task will only last 10 min's. So after the 10 min's you don't get any more call states.
B: Yes local notifications do work while on a call. I've done it and it works just fine.