According to Mr. Number posters, this is the old Canadian Pharmacy bull crap.
http://mrnumber.com/1-401-394-1419
I no longer answer my phone when I do not recognize the number. What a huge freaking hassle the telephone has become! The key to me is these [***] leave no message. When my aunt's nursing home or hospice care worker calls, they leave a message if I don't answer. Yes, you Canadian Pharmacy and other [***] out there, there is a special place in hell for those of you who abuse this telephone thing that we once called a "service."
I end the calls on 2nd ring, then block that number. I have at least 30 numbers from these [***] heads, ending call before they do gives me some pleasure.