Let this unrecognized caller go to VM. No message left so, blocked based on the above comment that it was a "police" fund raiser. For years we used to get calls from an outfit that allegedly were asking for money for a police "charity." I checked them out and they were not legitimate enough to hand over a single dime.
I wondered why they have a completely different phone number every year. Every year I block them - you probably should, too!