car audio auxilary input

[yagle]

can any one tell me why when i plug my phone into my car radio through a 3.5 male to male cable and the dongle that comes with the phone.. err why does it activate voice dial and call the last number dialed?.. is there somthing i can do to fix this?.. stock everything.. really dont know whats up with this but it really sucks becuase i bought the car radio just for the aux input..

Thanks