Regular phone call

Hi, I’d like to understand how the regular call feature works.

How do I activate it properly? I tried using it during some trial sessions, but it didn’t seem to work as expected. It wasn’t able to understand what the other person on the call was saying, and it also didn’t recognize my voice correctly.

It seems like it’s not functioning during calls, so I’m not sure if I’m using it the right way.

Could you please explain how this feature is supposed to be used?