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My remote party hears themselves, or there is a bad echo on the remote caller’s line.
This is a known issue.
Echo Cancelation / Noise Reduction (ECNR) is THE major obstacle in the production of hands free Bluetooth kits.
You may wonder why the car companies are able to implement this so well. These companies spend thousands and thousands of man hours perfecting the hands free feature. It's also worth nothing that they only have to worry about 1 system, 1 Bluetooth chip, 1 audio subsystem, and 1 microphone.
Out Bluetooth stack vendor is currently working on an even better solution.
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