Mig, I just hooked up a Sena 10U on my 16 RT. It was confusing at first because the BMW has its own radio. But in the BMW owners manual (for the audio system ) there are instructions called Expansion stage 4, which suite my use. No 2nd helmet, etc. I followed them to the letter and it works great. You might want to look at the options in the manual, and follow those instructions for the set up of your intend to use. I guess I'm assuming that you have the BMW audio system. Basically I didn't connect my phone to the Sena, but to the BMW GPS instead. And I don't use the Sena radio, but use the BMW radio. I don't answer the phone on my bike.
I keep thinking about it, but I keep forgetting what I was thinking about!
09 R1200RT gone
08 Harley Super Glide gone (and missed!)
80's Honda 900F gone
About 8 Dirt Bikes...Yes, I'm Old.