I phone 5 bluetooth connectivity issue

My iphone 5 with software version 6.1.4 was connecting flawlessly via bluetooth to the radio of my Toyota Highlander 2012. I could make calls thru the radio and listen to the music in my phone, all up to last Friday. Suddenly, the only thing working is the music, I can not hear my calls thru the radio. Eventhough the phone is paired ( I can hear the music DUH) when someone calls me the radio displays a PAUSE message and I have to anwer the call directly on the phone. I disconnected the iphone from the radio and paired it again several times but no response. What can I do to fix this problem?