Is the call recorded by default?

No. Nothing is recorded unless somebody presses record, and when they do, everybody in the room is told.

From the guide Booking a Call About Custom Pricing.

Recording

Either side can record. If anyone starts, a banner appears for everybody in the room naming who started it — there is no silent recording. The recording is made in the recorder’s own browser and offered to them as a file to download when the call ends. Seayora does not upload it, store it, or keep a copy.

Read the whole guide: Booking a Call About Custom Pricing

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