i have sent this !
And sometimes, when I try to dial, as soon as i press CALL, the Zumo goes back to the main screen, Zumo says (symbols) that he Headset and the Phone are connected. But from the on nothing works, and I get no audio to the headset at all. The only fix at this point is to re-boot the 550
I called Garmin today, I checked my software to make sure it had the latest version, Check. But that was really all that was politely offered.
Im going to clear out the pairing and try again tomorrow, but I don't have high hopes at this point