Enum server and congestion control method

Abstract

The present invention suppresses the number of connections from another network, and reduces the load on call processing apparatuses in a local network. An ENUM serverincludes: a congestion detection unitthat collects traffic information regarding calls that include call destination numbers from call processing apparatuses in the local network, calculates a call amount per unit time for each call destination number, and stores the call amounts per unit time as calculated call amount information, and also extracts a call destination number included in an ENUM query received from the other network, references the calculated call amount information, and determines that calls to the call destination number are in a congested state if the call amount regarding the call destination number exceeds a predetermined threshold value; a limit processing unitthat, if it was determined that the call destination number included in the ENUM query is in the congested state, determine whether or not the ENUM query is to be a limit target based on predetermined limit processing; and a signal response unitthat, if it was determined that the ENUM query is a limit target, generates an ENUM answer that indicates connection unavailability, and transmits the ENUM answer to the other network.