2004 Nav radio

[Indybucki]

I installed the Bluestar II and my phone automatically connects but when I receive a call it interrupts the radio about four times for only a second or so, then it drops the connection to my phone. I get no phone audio. I have an 07 CTS, swapped the orig radio/cd for a Nav system radio from an 04/05. Everything works fine but Bluestar. Any ideas?