A method for handling congestion in a communication network, known as a focussed mass calling event (MCE), occurring when the rate of calls to any given terminating number increases dramatically resulting in a large number of incomplete calls directed towards that number, known as ineffective attempts....http://www.google.com.hk/patents/US6243449?utm_source=gb-gplus-share專利 US6243449 - Mass calling event detection and control
