The prompt

If your firm has it turned on, pressing record shows Start Recording? before anything is captured:

You're about to start recording audio for the project you've selected.

This will capture system audio. Ensure you have consent from all participants before recording.

Recording may be subject to your organization's compliance policies.

Start Recording proceeds. Cancel stops, and nothing has been captured.

If you have an enrolled voice profile, the prompt also tells you that voice matching is on for the call. There's no per-call choice to make: enrolling is what turns matching on, and it's fixed at the moment recording starts.

You can turn it on or off yourself in Settings, under Recording. The toggle is Show Consent Dialog, described as "Ask for confirmation before starting each recording".

Saying it out loud

The prompt confirms you have consent. It doesn't obtain it. That still takes a sentence at the top of the call, and the plainest version works best:

I'm recording this so I can write it up accurately afterwards. Is that alright with everyone?

Wait for the answer. If anyone hesitates, stop recording and take notes instead.

Recording laws differ by where each person on the call is, not by where you are. Some places need everyone's consent, some only yours. Your firm will have a position on this. Follow it rather than working it out per call.

Questions

Does Junior announce to the call that I am recording?

Only on Zoom and Teams. Junior posts a recording notice into the meeting chat on both macOS and Windows so the rest of the call can see that recording has started.

Everywhere else, Junior records your computer's audio locally and does not join the meeting as a participant, so Meet and other platforms have nothing to announce and no recording indicator appears for anyone else. Nobody on the call knows unless you tell them.

Either way, a line in the chat is not the same as asking. That still takes a sentence at the top of the call.

The exception is sending Junior to a meeting, where it does join as a visible participant.

Someone asks me to stop recording mid-call.

Stop. Press Finish to keep what you've, or discard it entirely if that's what they've asked for. Discarding is permanent and unrecoverable, which is the right outcome here. Then say what you've done, so it's clear.

Do I need consent to take notes?

Notes are yours and aren't a recording, so the usual expectations of a meeting apply. It's the audio capture that changes the situation.