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A comment on Man Accused of Making 97M Robocalls. Parent comment

Re:Man Accused of Making 97M Robocalls by apotheothesomai on Wednesday April 18, 2018 @04:23PM (#16870829)
Pretty sure that is the reason. It's the phone equivalent of verifying an email. They ping, you pong, it goes on a list of verified numbers.
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Re:Man Accused of Making 97M Robocalls by JdeBP on Thursday April 19, 2018 @01:37AM (#16873574)
It isn't, though. Getting a ringing response is enough to validate a number, and someone who isn't making the effort to check contact lists against do-not-call registries won't be making the effort to track numbers that do not answer, either. In any case, RTNR to such people simply means that there's no-one to answer right now and is no reason to discard a number.

See https://news.ycombinator.com/item?id=16871131 and https://news.ycombinator.com/item?id=16873537 for what's actually happening.

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