Mike Donovan • almost 9 years ago
Treat VoIP gateways like SMTP gateways
Hypothesis: Many robocalls originate from IP-based VoIP gateways and supply bogus Caller ID data, or use "throwaway" accounts on otherwise well behaved small providers.
Solution: Create something similar to the SPF standard used by SMTP email servers to verify or block calls from bad sources, and create shared blacklists of misbehaving gateways. "Good" gateway owners can then "opt-in" to using this data to improve service to their own customers. This will motivate legitimate gateway owners to "clean house" much as email server owners have learned to do.
Problems: 911 and similar calls will need to be treated specially.
Note: This assumes that hardwire (non-VoIP) inter-exchange links are considered sufficiently trustworthy to be ignored by this system, although it could be extended if desired.
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