For legitimate outbound sales, I might be calling from 617-867-5309, but want my caller ID to always show up as the office main number (perhaps 617-867-5300). Or I might want to show my Google Voice (or Twilio or other) number as my number even if I happen to be returning your call from a specific line or phone.
As for felony life sentence, while I'm sure that's facetious for effect (and I chuckled), if you accept any of the above reasons, it seems you also need to allow for inadvertent misconfiguration. Once we broke up the telephony stranglehold (overall a good thing, I think), we allowed a bunch of federated phone systems to start working together, most of whom are good actors.
As for felony life sentence, while I'm sure that's facetious for effect (and I chuckled), if you accept any of the above reasons, it seems you also need to allow for inadvertent misconfiguration. Once we broke up the telephony stranglehold (overall a good thing, I think), we allowed a bunch of federated phone systems to start working together, most of whom are good actors.