Patent ID: 7916643

Claim:
A method for limiting extreme loads and reducing fluctuations in load at session servers, the method comprising the steps of: calculating a number of in-dialog messages received over a first fixed interval of time; calculating a number of out-of-dialog messages received over a second fixed interval of time; determining a first ratio equal to an average number of said in-dialog messages received over said first fixed interval of time divided by an average number of said out-of-dialog messages received over said second fixed interval of time; determining a second ratio equal to a maximum number of messages allowed over a period of time divided by a number of messages admitted on a previous interval of time; and calculating, by an admission rate controller of a router, a maximum number of said out-of-dialog messages to be sent to a particular session server over said period of time based on said first ratio and said second ratio when an overload condition has been detected.