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    <p>This is an old thread, but may warrant an update.</p> <p>As of iOS 6, this is the behavior I am seeing with the VoIP timer background methods as discussed in this thread:</p> <ul> <li>The VoIP BackgroundMode is still strictly banned from AppStore apps via the App Review Process</li> <li>The minimum KeepAlive time is 600 seconds; anything less than that will cause the handler to fail to install (and a warning is sent to NSLog)</li> <li>Setting the keepAlive time to something significantly larger than 600 seconds will typically result in the handler being fired with a frequency of every <strong>time/2</strong> interval. Bonus fact: This is consistent with the SIP REGISTER request, in which the recommended re-registration interval is .5*re-register time.</li> <li>When your keepAlive handler is called, I have observed the following: <ul> <li>You get about <strong>10 seconds</strong> of "foreground" execution time, in which remaining background time is infinite (as returned by <strong>backgroundTimeRemaining</strong>)</li> <li>If you kicked off a <strong>beginBackgroundTask</strong> from within the keepAlive handler, I have observed that you get <strong>60 seconds</strong> of background execution time (as returned by <strong>backgroundTimeRemaining</strong>). <em>This is different than the <strong>600 seconds</strong> you get when the user transitions from your app being active to backgrounded.</em> I have not found any way to extend this time (without using other trick like location etc.)</li> </ul></li> </ul> <p>Hope that helps!</p>
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