Method of providing voice communication services and system for the same

To expand the call area for wireless IP phones without imposing significant economic costs on IP telephony service providers. In a voice communication service system JH, a service provider provides voice communication service to a subscriber who has paid a predetermined service charge, using an authorized access point and spare bandwidth available on an authorized broadband connection. Where spare bandwidth on an authorized broadband connection is used by a third party, the authorized access point owner and line lessee of the authorized broadband connection receive a rebate, based on usage of the spare bandwidth, from the service provider.