Still looking for a solution....
I have my phone on quiet mode but I have my important calls checked on my exception list.
The issue is when I get a call from someone not on my important call list it doesn't ring which is what I want but if they leave a message it rings through as a voicemail alert.
The audible alert is whatever profile I have checked on my important calls exception.
Hope this makes sense but its frustrating to have it on quiet and have an audible voice mail indicator come through.