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With the ease of obtaining phone numbers there probably needs to be a different approach as well. Blocking a set of their outbound numbers would prove nothing more than a brief annoyance - not to mention CID spoofing still being a possibility from VOIP companies that allow it.

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Furthering this argument, if a robocaller uses a phone number briefly and discards the number after it is banned, the next user attempting to make a legitimate emergency call using the banned number may not get through.

But that is a good thing, since it will make an incentive to prevent robocalls, just like there is an incentive to not forward mails.

Excellent point - it seems that tightening up the ease of getting a new number would be important - yet that just causes other issues, people just don't want to have to jump through hoops.

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