| 摘要 |
<p>According to various embodiments of the present invention, a two number service system comprises: a first terminal device which requests a call to a mobile communication exchanger, if a call request having a basic number as a calling number is inputted; a mobile communication exchanger which, when a call request is received from the first terminal device, determines whether a called number is a basic number or an added number and requests a call to a second terminal device if the number is the basic number, and forwards a call request to a voice over IP (VoIP) exchanger if the number is the added number; a VoIP exchanger which requests a call to the second terminal device, when a call request is received from the mobile communication exchanger; and a second terminal device which performs a call with the basic number if a call is requested from the mobile communication exchanger, and performs a call with the added number if a call is requested from the VoIP exchanger.</p> |
