Hi. As I understand it, with VOX Intercom, when a rider wants to speak to another rider speaking or blowing into the mic will activate it and then open the intercom channel with the other paired headset. When the mic detects the intercom conversation is over, it will start a 20 second countdown and then close the intercom channel.

However, with mine, no matter how long me and my pillion stay quiet, it never detects that the conversation is over. The intercom channel just remains open all the time. 

I've tried lots of different settings, different mics and even placing the mics differently, but I can't get the channel to shut.