FWIW. This may be a valid call, but I'm suspicious. I did not answer the call and no VM left. The CID listed the name of a person. When I googled the number and person the White Pages showed a match. So I called the number twice and got the same telephone company recording: "this number has been disconnected and is no longer in service". I suspect Caller ID spoofing.
In the white pages, (415) 752-6922 is registered to Natalie Osipoff. I received two calls from this number, but no messages. Call back is answered by the "disconnected number" message.