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A comment on Ringless voice mails from telemarketers. Parent comment

Re:Ringless voice mails from telemarketers by ziszis on Saturday June 03, 2017 @05:50PM (#14478694)
Most of the call spam blocking solutions suffer from needing to trust Caller ID. Spoofing caller ID is now trivial and used by spammers [1] There are some work arounds to this like "audio fingerprinting".

[1] https://en.wikipedia.org/wiki/Caller_ID_spoofing

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