[Phalse]

I have searched for this for a while now and I can't find it anywhere. I came across it on some forum (might have been this one) and I forgot to bookmark it.
Time and time again I get the problem that when somone tries to call me, it rings 3 or 4 times before it actually rings on my phone. I read somewhere that its because it only checks the tower every 5 seconds and there is a registry entry that can change it to a shorter time interval.
Any suggestions?