Patent ID: 7209447

Claim:
In a data network comprised of a plurality of data switches that transfer data packets for a first telephone call through a first set of said switches at a predetermined rate, a method of maintaining transmission quality comprising: a. counting data packets received at a first switch during a predetermined time period; b. determining a difference between a number of data packets received at said first switch during said time period, and an expected data packet count value, the number of data packets received being adjusted for late packets and lost packets; and c. upon the determination that said difference between said data packets received and said expected data packet count value, exceeds a first threshold, routing successive data packets during a remaining time duration of said first telephone call through the first set of said switches and thereafter routing subsequent data packets for a subsequent telephone call through a second set of switches to maintain the transmission quality for a constant transmitted transmission rate, the remaining time duration being the time left in said first telephone call.