The optimum setting (default setting) for most connections.

Volume-optimised handsfree mode. Call participants must speak successively, as the party who is speaking takes priority for transmission (more difficult if parties speak simultaneously).

Optimises simultaneous speech - both parties are able to understand one another, even if they speak at the same time.

Optimised for special connections. If the pre-setting (Profile 1) does not provide the best sound, try this setting first.