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A comment on Ask HN: Why is Bluetooth so unreliable?. Parent comment

Re:Ask HN: Why is Bluetooth so unreliable? by dfox on Wednesday July 12, 2017 @03:12PM (#14755638)
What profile is used for phone calls depend on configuration of the phone and the headset.

Last week I accidentally found out that I can use two phones at once with integrated HF in my car's radio as long as they use different BT profile (somewhat unsurprisingly, while trying to fix completely unusable sound quality over BT)

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Re:Ask HN: Why is Bluetooth so unreliable? by arghwhat on Saturday July 15, 2017 @03:30AM (#14775489)
That's so you can have a music device and calling device connected simultaneously. Both connections can be consumed by one device if you want both music and call functionality.

I don't think your phone will try to use A2DP for a call.

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