Patent ID: 7372844

Claim:
A call routing method in VoIP (Voice over Internet Protocol), the method comprising steps of: obtaining an equation for getting a prediction MOS (Mean Opinion Score) value based on a regression analysis using a voice quality measuring system, the system having an originating side, a destination side and a network parameter emulator connecting between the originating side and destination side, each side including IP (Internet Protocol) phones, gateways and computers, where each of the computers has a built-in sound card and a voice sample for measurement of voice quality; obtaining for each destination gateway, at an originating gateway in a gateway over VoIP network, a corresponding prediction MOS value using a ping system, by first obtaining a packet delay, a packet loss, a packet length, and a jitter value for the respective destination gateways, and applying the packet delay, the packet loss, the packet length, and the jitter value to the equation to obtain a calculated prediction MOS value for each of the destination gateways; obtaining, at the originating gateway, a final prediction MOS value for each of the destination gateways based on the calculated prediction MOS value and a transmitted prediction MOS value transmitted from each of the plurality of destination gateways; constructing, at the originating gateway, a gateway routing table having designated gateway group table numbers in accordance with access codes, and for constructing a gateway group table having a gateway IP address field for each destination gateway in the gateway group and a prediction MOS value field for designating the final prediction MOS value for each destination gateway in the gateway group; and when performing a call routing to a gateway group under an access code, performing, at the originating gateway, the call routing to the destination gateway with a maximum prediction MOS value, the gateway with the maximum prediction MOS value being one of the destination gateways in the gateway groups that are grouped in accordance with access codes.