Patent ID: 8243704
Filing Date: 2012-08-14
Classification: H04L

Abstract:
1. A call control device which controls call connections between a plurality of terminal devices, the call control device comprising: a device information storage unit that stores device information on call-connectable terminal devices; a call request accepting unit that accepts a call request from a first terminal device to a second terminal device; a determining unit that determines, when the call request accepting unit accepts a call request, whether the device information of the second terminal device is stored in the device information storage unit; a holding unit that holds a call state of the first terminal device when the determining unit determines that device information on the second terminal device is not stored in the device information storage unit; a state acquiring unit that acquires state information indicating a state of the second terminal device; and a holding tone setting unit that sets a holding tone to be transmitted to the first terminal device when the state information acquired by the state acquiring unit indicates that the state of the second terminal device is in the process of establishing an Internet Protocol connection, authenticating a Virtual Private Network, or communicating with the call control device.