This happened to me. I got a very angry call from someone asking why I was spamming them and had to explain that someone was spoofing my phone number to call similar phone numbers, and that it could be happening to his number or anyone else’s as well. I look forward to being globally blocked. :(
This is Windows-based and mutes your microphone globally, but if you’re concerned about leaking video/audio accidentally I’ve found it very helpful:
https://learn.microsoft.com/en-us/windows/powertoys/video-conference-mute
This is part of PowerToys. It says “legacy mode” because they were gonna deprecate it now that they’re trying to build the functionality into W11, but relented and are keeping it based on the outcry from W10 users.