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Withtheincreasingpopularityofinternettelephony,theissueofspamcallshasbecomeamajorconcernforusers.Tocombatthisproblem,thereareseveralmechanismsinplacetopreventharassmentandunwantedcalls.Oneofthemainmethodsusedtopreventspamcallsiscallblocking.Userscancreateablacklistofnumbersthattheydonotwishtoreceivecallsfrom,andthesenumberswillbeautomaticallyblocked.Additionally,thereareappsavailablethatcanidentifyandblockknownspamnumbers.AnothercommontechniqueistheuseofCAPTCHAcodesforverification.Whenmakingacall,usersmayberequiredtoenteraCAPTCHAcodetoprovethattheyarenotarobotorautomatedsystem.Thiscanhelptoreducethenumberofspamcallsgeneratedbyautomateddialingsystems.Furthermore,someinternettelephonyprovidershaveimplementedalgorithmsthatanalyzecallpatternsandbehaviortoidentifypotentialspamcalls.Thesealgorithmscandetectunusualcallingpatterns,suchasmultiplecallsmadeinashortperiodoftime,andblockthembeforetheyreachtheuser.Overall,withthecombinationofcallblocking,CAPTCHAverification,andadvancedalgorithms,internettelephonyprovidersareworkingtocreateasaferandmoresecurecallingenvironmentforusers.