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Withtheadvancementoftechnology,ithasbecomeeasierforpeopletomakephonecallsovertheinternetusingserviceslikeVoIP.However,manypeoplewonderhowtheycantracktherealphonenumberinformationofsomeonemakingacallthroughanetworkphone.OnewaytotracktherealphonenumberinformationofanetworkphonecallisthroughtheuseofcallerID.Whensomeonemakesacallthroughanetworkphone,theircallerIDinformationistypicallytransmittedalongwiththecall.Thisinformationcanbeusedtotracktherealphonenumberofthecaller.Anotherwaytotracktherealphonenumberinformationofanetworkphonecallisthroughtheuseofcalltracingservicesprovidedbyphonecompanies.Theseservicesallowuserstotracetheoriginofaphonecallbyprovidingthephonenumbertothephonecompany,whocanthentrackdowntherealphonenumberinformation.Inconclusion,trackingtherealphonenumberinformationofanetworkphonecallcanbedonethroughtheuseofcallerIDandcalltracingservicesprovidedbyphonecompanies.Thesemethodscanhelptoidentifytherealphonenumberofacallermakingacallthroughanetworkphone.