SilentCallsVictim
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We all decide which calls we answer in person, by machine or not at all. The CLI can help inform that decision, whether it is made in person or by a machine.
Obviously we never be totally sure which calls will, or will not, be a nuisance (except perhaps where a particular number is recognised), but the CLI can help inform the decision about what to do.
My advice is as follows:
Before adopting a standard treatment for calls with any particular generic CLI (e.g. Withheld, Unknown, International) or for all unrecognised numbers, do please be sure that you understand the consequences. There can be no guarantee that all such calls will or will not be nuisance calls. There could be a danger of missing wanted, or even very important, calls.
If you accept all calls with CLI provided, be aware that this will include nuisance calls made with a false or useless presentation number. Devices that block calls from withheld numbers simply encourage nuisance callers to provide worthless presentation numbers. I understand that BT is planning to cease its suppression of CLI from overseas sources.
Measures taken by individuals can help, but I am campaigning to get the problem of nuisance calls resolved nearer the source.
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