Originally Posted by DRTBYK
You are trying to pair two "slave" devices. The dongle you are using is configured as a Bluetooth "remote/headset" device. The SRC-System is a "Remote/Headset" device. In a Bluetooth world something has to be the "Master" or controlling device.
As I said in my first post, you can not do what you want to do with the zumo550 and a dongle.
Hope that helps.
He could pair a BluBridge Rx to the transmitter, patch it into the aux-in of the Schuberth, and pair the 550 directly to the helmet.
This would give him stereo, intercom, and full phone access - all wireless.
It might look like shit with the receiver taped to the back of the helmet, but it would make a great conversation starter wrt the superiority of German technology.
edit: After looking at the instructions, an audio connection requires their long proprietary cable. It would be easier to ditch the adapter and extend the 550 output to a convenient location and use a wired solution for stereo.
Find an FM transmitter with decent output and tune the helmet radio to the transmitter. Pair the zumo to the helmet solely for phone use.