[Q] How can an alarm on my android phone trigger a fake sip incoming call ?

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http://forum.xda-developers.com – I have a SIP hardware phone connected on my DSL home lan. Once in a while (ab ev month or so) I got a fake incoming call, where instead of incoming number I see a 3-4 digits number on the phone screen. Of course the call is fake, no-one is on the other side when I try to answer. Today I needed to wake up early to work (it's 3:50am in Europe) and set a standard alarm on my Dell Streak (unhaked Android 2.1, os alarm, no strange app). 3-4 seconds before the alarm went, I got the fake call. Now, I don't believe in coincidences and no-one knew I would have had to wake up so early so I can wi (HowTos)