90% of my received voicemail is short and completely silent because callers didn't hang up quickly enough. it is very inconvenient to get notifications about absolutely nothing, then have to manually delete them. please filter these out and delete them on the server side
I don't think the system is sophisticated enough to "detect" these and auto-delete them. It just records the persons message and ends when they hang up; it doesn't know the contents of the voicemail on its own.