I see there are some guru's on here, so here we go...... 
  
I bought a bluetooth adaptor from someone on here, it connects and seems to work. But I bought my zed with an aftermarket single din sat nav player. But when I try to make a call it doesnt mute the music, or come through the speakers.  
Is this a problem with my harness?  Or need a different one?  
  
If anybody has any advice on this, that would be great. 
  
Cheers in advance 
  
Sam