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I can’t get it to work, but that doesn’t mean it is not possible.
I’ve seen other people say that I need to use a TCP Port, but does anyone have any pointers to any kind of official documentation that would have the final say?
Yes, that’s the point.
But in iOS 4.2.1 (for example) you can receive in UDP while in background WITHOUT any ack.
Just declaring a CFReadStream as a VoIP socket listening in applicationDidEnterBackground… From iOS 4.3 and above that method doesn’t work anymore.
Also Media5 uses a “trick” to keep active the app, thus receiving incoming calls in background also with UDP.