As long as you keep it fair, as in not many users, not too many streams etc, https://fairmeeting.net/ offers videocalling for free. I think it is using Jitsi.
They also offer paid versions that you can use should you require more than a few users.
More of a videoconferencing software, but BigBlueButton is open source, so it doesn't belong anywhere. The foundation (company) sits in Canada. YMMV with BBB, though. Many, many students learned hating that thing for various reasons.
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