Ok I've found the explanation... Apparently if you got an unknown contact (thats not in your contact list) in your call history and you click it, it will immediately dial, otherwise it works fine...
Check a few posts down in this thread:
Code:
http://www.spbclub.com/forum/viewtopic.php?t=24084&sid=410f8b0780b4967bcbb6e7221f0d530c