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Thenetworktelephoneanti-harassmentmechanismreferstothesystemortechnologydesignedtopreventunwantedorunsolicitedcallsfromreachingusers'phones.Thismechanismisessentialinprotectingindividualsfromreceivingannoyingorpotentiallyharmfulcalls,suchasspamcalls,scamcalls,ortelemarketingcalls.Therearevariouswaysinwhichthenetworktelephoneanti-harassmentmechanismworks.Onecommonmethodisthroughcallblockingorscreening,wherecertainnumbersortypesofcallsareautomaticallyfilteredoutbeforereachingtheuser'sphone.Anotherapproachisthroughtheuseofcallauthenticationtechnologies,whichverifythelegitimacyofthecallerbeforeallowingthecalltogothrough.Overall,thenetworktelephoneanti-harassmentmechanismplaysacrucialroleinensuringasafeandpleasantuserexperiencewhenusingphoneservices.Byimplementingeffectiveanti-harassmentmeasures,phonecompaniescanhelpusersavoidunwantedcallsandprotecttheirprivacyandsecurity.