Patent ID: 8284762

Claim:
A telephone system comprising; a plurality of exchanges interconnecting a plurality of communication terminals to one another through a communication network, each exchange receiving from each communication terminal a connection request that includes an extension number that is assigned to each user, each of the exchanges comprising: a management database in which the extension number assigned to each user is correlated with an address information of a default exchange that receives a default communication terminal assigned by default to the user; an acquisition processing unit configured to extract an extension number from the connection request and acquire the address information of the default exchange by accessing the management database with the extension number extracted from the connection request, in response to the connection request received from a specific communication terminal included in the communication terminals; and a notification processing unit configured to notify the specific communication terminal sending the connection request, the address information of the default exchange acquired by the acquisition processing unit, wherein each of the communication terminals comprises: a user interface configured to allow a user to input the extension number assigned to the user; a connection request processing unit configured to transmit the connection request including the extension number input by the user to one of the exchanges receiving the specific communication terminal; and a re-connection request processing unit configured to transmit the connection request to the default exchange based on the address information of the prescribed exchange is notified from the exchange notification processing unit in response to the connection request.