I let the answering machine pick up.  It was a recorded message asking if we wanted to purchase a medical alert tag.  Then said the press #1 if we wanted to make the purchase.

Google Voice said caller hung up on challenge. Typical for Telemarketer scammers. Will block.

They called but I didn't answer. They left the following voice mail:

"You've been referred to by a friend or family member. We have the system waiting to be shipped out to you press one now to receive your personal medical alert system again press 1 now to receive your personal medical alert system press 9 to opt out."

Rang once and hung up. Caller ID said: Christopher Hill. Not the first time I received this call.

Unknown caller - spam call most likely.