The only time I answer a call from an unknown caller is if I am reasonably certain it is a scam then I answer and immediately hang up so I don’t have to waste time cleaning out voicemail.
The Robo calls I get rarely leave a message. Had an IRS scammer with a foreign accent leave one. I do get automatic calls for the previous owner. Calls like school closings and weekly church info. I’ve blocked those calls and clean out that voicemail every few months. It doesn’t intermingle with my regular voice mail.