VOIP GATEWAY DEVICE, CONTROL METHOD THEREOF AND VOIP GATEWAY SYSTEM

摘要

PURPOSE: A voice over Internet protocol (VoIP) gateway device, a control method, and a VoIP gateway system are provided to provide a call back function without changing software of a proxy server, thereby reducing load on the proxy server. CONSTITUTION: A storage unit (130) stores a ringtone corresponding to a call received by the call back function. A controller (140) transmit an invite message to a proxy server to connect a call from a first terminal to a second terminal corresponding to the call back function upon a request from the first terminal for the call back function. The controller receives a ringing message from the proxy server in response to the invite message. The controller transmits the stored ringtone to the first terminal. [Reference numerals] (100) VoIP gateway device; (110) Connection unit; (120) Communication unit; (130) Storage unit; (140) Controller; (200) Proxy server; (300) First terminal; (400) Second terminal; (AA) Internet