iTunes autoplays when bluetooth audio devices used

I am using MacbookPro 15" with Retina 2013, El Capitan. I use this with a Plantronics Voyager ear piece for audio telephony (Cisco Jabber), the device is paired with my Macbook and my Cisco desk phone. I also use wired keyboard (occasional bluetooth k/b) and a Magic Trackpad 2. In order to get optimal performance with the ear piece, I set my Sound default to PLT Voyager Output / Input - Bluetooth. However, this triggers iTunes to to start playing music from my playlists without my input and creates interference (sound quality) via the ear piece etc. This doesn't happen under wired headset devices with the bluetooth k/b, mouse or trackpad. Only bluetooth headsets such as the PLT earpiece or my B&O headphones. To me this feels like a bug in iTunes handling with bluetooth audio devices as opposed to specific bluetooth devices, I will note that both the PLT Voyager and B&O headphones share the same Cambridge Silicon Radio manufacturer. Anyone else get similar ?