Called my DNC registered landline. No voicemail.
I called back using *67. It didn't ring. Just silence. I tried a second time with the same results. No even and Out Of Service message.

I answered this call because I have friends in NY. I'm on DNC list, for whatever that's worth.  When I answered, a male asked if he could speak with "Mr. & Mrs. Larson." I abruptly informed him he had the wrong number and then googled the number. After reading other experiences, I wish I hadn't answered the phone at all. I prefer to ignore and then block spam calls. I believe this call was an attempt to verify if my number worked.   This number is now blocked.

Called my cell.  No message left.  I'm blocking the number.

Repeat caller called again on 10/7. No voicemail.