Random noises from _muted_ participants

[nicdoye]

I'm often in a team meeting with a dozen participants. Normally after each person speaks, they go on mute. However, there appears to be a bug that is triggered by going on mute, that random blips occur, which sound like repeated audio frames from the next person to speak, until the previous person unmutes and re-mutes.

We're all on Mac (except one user) and are normally pretty up-to-date (centrally managed, currently all on 5.17.5 (29101) but it's been going on for ages).

I've not been able to find out if this is a known bug or not, as searching for this issue comes up with a lot of random unrelated problems.

[Jason_K]

nicdoye, check to see if it is related to the Audio Watermark function.

https://support.zoom.com/hc/en/search?id=search#q=audio%20watermark&t=All&sort=relevancy

[nicdoye]

I'll have to check with our admins to see if that's enabled.

It looks like it's always the same two users (at the moment) who, when they go on mute, trigger the spurious sounds.

[nicdoye]

After some more months of observation, this turns out to be when a participant is connected via Ivanti VPN, and goes on mute.

It feels like the algorithm which deals with muting and noise-cancelling, instead of just cutting all audio input from that user, is just zeroing the last few audio frames, and "older" (10s of milliseconds) packets are still getting through.

It's odd that asking the user to un-mute/re-mute usually fixes this.