Actually I got ahead of myself when I posted this....I can receive and hear calls, but as many others have stated, we can't talk. I'm still trying to figure out how to add this to my Arai helmet with integrated J&M head set. It's really frustrating and I don't want to buy another helmet. So....anyone with any ideas out there to make this set up work, would appreciate your help...I'm sure there are plenty of others that could benefit from this information also.
You will not be able to use the J&M headset, or any other hard-wired headset to make and receive phone calls through the Zumo. The problem is that the headset / radio combination is not Bluetooth capable. You can hear the calls come in, but that is only because the Zumo is sending the audio to the radio, just like it does with the navigation instructions and MP3 output.
In order to use your phone on the bike with your helmet and Zumo, you will need a Bluetooth enabled headset. Nolan has their own, self contained unit, to mount in the N-com, but you can't use it because you have the J&M units.
The ony way you would be able to do what you want is to install the HK Bluetooth Module on the bike, but then you will not benefit from the Bluetooth of the Zumo.
I hope this helps.