Issue: stuttering audio at the start of the video call
There was a known issue affecting Apple devices running iOS 14.2 which caused stuttering audio when joining video calls. The audio would then often stabilize itself after some time.
Apple fixed this issue with the release of iOS 14.3 and iPadOS 14.3 to the public on 15th December, which included an update of Safari to version 14.0.2.
To avoid any technical issues, please make sure that you update to iOS 14.3 and iPadOS 14.3.