I just want to point out that Signal, the encrypted messaging/voice chat app is using CBR for that reason: it should be possible to reconstruct the words spoken

I just want to point out that Signal, the encrypted messaging/voice chat app is using CBR for that reason: it should be possible to reconstruct the words spoken using the metadata that is leaked from a VBR. Of course, that means losing some bandwidth, so it is not the most bandwidth-efficient app. https://whispersystems.org/blog/signal-video-calls-beta/ https://whispersystems.org/blog/signal-video-calls-beta/