So as I understand it you need to be able to receive calls from (a) known family or business callers who's numbers display and (b) those withheld or anonymous numbers which are not spam - eg doctors, social services or other on PDA business.
The only option I've seen described that might work, apart from NoFM's suggestion of diverting to a mobile, is the Call Guardian type set up where your calls are screened before being offered.
What interests me is why you get so many spam calls over such a lengthy part of day. I get the odd one, but only a handful a week. Was at home all day on Tuesday and got one but answered and immediately hung up - spoof number with too many digits. Is reason fact that your number is out on net for PDA and perhaps professional use?
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