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    <p>When you call <code>-setKeepAliveTimeout:handler:</code>, you only get a maximum of 30 seconds to complete everything and suspend. You're not given the same <em>background grace period</em> as you'd be given when your application is first transitioned to the background. That's meant for finishing up long running tasks, shutting things down, etc.</p> <p>With the VOIP callback, you're just supposed to send whatever ping packet you need to send to your service to keep the network connection alive and not timed-out. After 30 seconds, regardless of starting new background tasks, if your application is still executing, you're gonna be terminated.</p> <p>Also, it's important to note that if you're not actually a VOIP application <em>or</em> if you do anything during the VOIP callback window that's not related to keeping your network connections open, your app <strong><em>will</em></strong> be rejected from the app store. When you set any of the stay-active flags (VOIP, background music, navigation), they test it pretty rigorously to ensure that it <em>only</em> does what it's flagged to do while in the background. Doing any kind of HTTP GET request and waiting for some large data update to come back is almost guaranteed to get your app rejected.</p> <p>EDIT: As noted by Patrick in the comments, the current amount of time the block is given to execute has been reduced from 30 seconds to 10 seconds with iOS 5. It's a good idea to keep an eye on these times whenever you re-link your application for a new version of the SDK, always at least quickly check the docs in case they've been updated (with iOS 6 coming out, this number may be tweaked again).</p>
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    1. COmany thanks for your reply. First of all, the reject is not an issue, since the app is a private app not for AppStore. Regarding the timeout of 30secs, i readed about it, but i cannot understand why the crash log tell me about a 600.00secs timeout, not a 30.00secs. Moreover, sometime the methods works, others they don't.
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    2. CO@valvoline: The times it doesn't work, you're background task is obviously taking too long. The docs say 30 seconds, but perhaps that's the soft number and the OS really give you 10 minutes, I'm not sure. We know, though, that something is blocking at some point and your thing cannot complete, and since the VIOP was designed for a quick check, it's possible that the error handling from the OS is confused (like not calling your cancellation block or something).
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    3. CO@jason: Do you have any specifics about what they require in this VOIP window? Does it state that anywhere public?
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      1. USAviad Ben Dov
 

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