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While VoIP may be using the internet to transmit voice data, when you try to call a PTSN (Public Switched Telephone Network aka “normal” telephone service) number, the provider is going to have to connect with the telephone company. The VoIP carrier usually enters a fee agreement with the phone company, and then the VoIP provider rolls that into its monthly charges as a flat fee. It may depend on company, though, so you should clarify this early on when talking to a potential VoIP carrier.