Sure, but that doesn't necessarily do all that much to stem the tide. The spam callers care a hell of a lot more about maintaining access and call volume than t

Sure, but that doesn't necessarily do all that much to stem the tide. The spam callers care a hell of a lot more about maintaining access and call volume than the telcos care about ensuring spammers stay off the system; if they don't have multiple redundant systems run by facially independent cut-outs, they're organizationally incompetent. Like, employing someone to hire people off craigslist to help "set up their new business" by opening an outbound phone account under the craigslister's name is cheap compared to the gains from running the spam network.