Do callers in general (and thinking specifically of industrial-scale telemarketers and also hackers or spammers trying to commit fraud) know that when they punch in your TN, that it terminates at either (a) a PSTN / pots line or (b) a voip DID? Is there a (c)? I suppose they have easy or simple means to know if it's a (d) cell-phone TN.
Or is this more of a question of do they care (if it's a vs b) - or are they beginning to care (is it affecting them, what-ever their business model is)?
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