Comment 11 for bug 508522

I'll add a vote that this feature is definitely worth fixing. Little bluetooth speakers, headphones etc. are proliferating for audio outside of just phone calls. The gadgets all seem to include a mic, so you can answer calls when listening to music transparently (great for voip too of course). As mentioned above, other OSs handle this case. I suspect every college student on earth is going to have these speakers in a couple years, as it's such a seamless way to listen to music from the phone/tablet/etc.

Googling around, it looks like A2DP does not support mic input. My guess is other OSs support this by hacking A2DP mode to also support using HSP for simultaneous input, though in the UI the user sees A2DP and HSP as two mutually exclusive choices.

I guess one could just go look at how Android does it.