Per John Albert:

Put your incoming calls on VOIP (phone over the internet).

Then, sign up for "nomorobo.com".
(assuming your ISP/VOIP service will handle it)

That's what I was thinking about if/when I go over to
CallerID/Simultaneous ring.

Had not considered that Simultaneous Ring might be available via my VOIP
provider.... Gotta look into that.
--
Pete Cresswell