[Q] Nexus 7 as a bluetooth headset?

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http://forum.xda-developers.com – Hey guys I'm using my nexus 7 dashed in my car. (Kinda!) And i'm using tablet talk to connect my phone with it. Also i have a bluetooth keyboard connected to my tab. When i have a text, i can answer it easily. But when someone calls me and i accept the call the sound doesn't come from my car audio and my sound doesnt go through my tablet's mic. They bouth go through my phone! So i have to use my n7 as a bluetooth headset for my phone. Is it possible? Can anyone guide me? (HowTos)