Patent ID: 8832307
Filing Date: 2014-09-09
Classification: H04M

Abstract:
1. A telephony system comprising: a plurality of terminal devices; and a connection control device capable of communicating with the terminal devices, wherein one terminal device includes a transmitting section for transmitting a connection request for requesting establishment of a call connection with other terminal device to said connection control device, said connection control device includes: a storage section; a receiving section for receiving the connection request; a controller capable of: establishing a call connection corresponding to the received connection request; determining whether or not the connection control device is in a congested state, based on whether a usage of at least one of hardware resources necessary for call processing to establish a call connection is equal to or more than a predetermined threshold value; setting a connection available time until disconnecting an established call connection, when determined that the connection control device is in the congested state; measuring a connection time of an established call connection; disconnecting, while the connection control device is in the congested state, any established call connection for which the connection time exceeds the connection available time; if a connection request is received from one terminal device while the connection control device is in the congested state, storing connection information containing terminal identification information identifying each of originating and destination terminal devices corresponding to the received connection request in the storage section according to an order in which connection requests are received; and calculating a wait time until establishment of a call connection between terminal devices corresponding to the stored connection information becomes available, based on the connection available time and the order in which connection requests are received; and a transmitting section for transmitting time information indicating the wait time to the originating terminal device; and the telephony system further comprising: a plurality of said connection control devices, wherein if a connection request is received from one terminal device when determined that one connection control device is in a congested state, the transmitting section of the one connection control device transmits to other connection control device the connection information and time information indicating the wait time corresponding to the received connection request, said controller of other connection control device is further capable of: storing the connection information and time information received from said one connection control device in the storage section; determining, when a connection request from one terminal device is received, whether or not the terminal identification information about originating and destination terminal devices corresponding to the received connection request matches that in the stored connection information; when determined that they match, determining whether or not the corresponding wait time has elapsed; and discarding the received connection request if the wait time has not elapsed.