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So to make things clear, you can't hear the person on the other end through your speakers when you dial out? what about when the call comes in?
Please let me know what works or doesn't work when it comes about the calls themselves...... coming in as much as dialing out.
What I would suggest doing is unpairing the devices completely, then starting the pairing from the beginning. There are two bluetooth pairings that take place - one is for the high quality audio used for just listening, and the other is the phone pairing. They are two separate pairing profiles, so they don't both happen at the same time by default. If you only have one of them completed, it may be difficult to do the other without re-pairing the device completely.