Abstract: Provided are a Voice over Internet Protocol (VoIP) gateway device, a control method thereof, and a VoIP gateway system. The VoIP gateway device includes: a connector which is connected to a first terminal; a communication unit which communicates with a proxy server that relays a VoIP communication; a storage unit which stores a ringtone corresponding to a call received by a call back function; and a controller which transmits an invite message to the proxy server for connecting a call from a first terminal to a second terminal corresponding to the call back function upon request from the first terminal for the call back function, and transmits the stored ringtone to the first terminal upon receiving a ringing message from the proxy server in response to the invite message.