Thanks for the additional number. I blocked both numbers. FYI. Try this - it works for me. Put your landline on silence and have it forward just the known numbers in your address book. Anyone else must leave a message. :)
Before I began using the forward feature on my system, I had blocked over 1,000 numbers and identified several relatively large banks of pesky phone numbers. One bank of numbers spanned 100 numbers - from "Agent," purportedly looking for a relative!