If you wait long enough after answering, you get a recording that says to stay on the line for the next available operator.  I didn't wait long enough to hear what they had to say.  ANNOYING!

Calls both my home phone land lines at the same time - never says anything, just hangs up.

Same here, 12 minutes after the first post.

Must be a fresh telemarketer spoofing number.

Call and hang up, no message. No doubt a new one for the "home improvement" scum.