Not able to hear phone calls through my already connected bluetooth headphones

Hi there-

I can hear all iphone audio through my Push Active Skull Candy headphones aside from phone calls. This randomly stopped working for me about 2 months ago. I have tried these options already:

• restarting my iphone
• disconnecting and reconnecting my headphones
• Go to Settings>General>Accessibility>Call Audio Routing, and make sure that it is set to Automatic

Note that my wired headphones and another set of bluetooth headphones works just fine with my iphone calls still. I'm lost, help!