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US 2004/0165570 A1Published application
Call routing method in VoIP based on prediction MOS value
AssigneeSamsung Electronics Co., Ltd.
InventorDae-Hyun Lee
Life of this patent
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Abstract
A call routing method in VoIP (Voice over Internet Protocol) capable of performing voice service assuring best voice quality is obtained by predicting voice quality using network parameters that affect the voice quality, and then performing a call routing to a gateway with a maximum MOS (Mean Opinion Score) value out of a gateway group. Also, actively responding to organically changing network environment and providing a best call routing path for the network environment before setting up a call, best voice quality can be provided.
Claims12
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 personal computers, where each of the personal 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.
3 more elements
A method for predicting voice quality over an VoIP network, 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 a transmitting side, a receiving side and a network parameter emulator connecting between the transmitting side and receiving side, the transmitting side including transmitting IP (Internet Protocol) phones, transmitting gateways and transmitting personal computers, where each of the personal computers has a built-in sound card and a voice sample for measurement of voice quality and the receiving side including receiving IP (Internet Protocol) phones, receiving gateways and receiving personal computers, where each of the receiving personal computers has a built-in sound card and a voice sample for measurement of voice quality;
- obtaining, at the transmitting gateways, prediction MOS values using a ping system, by first obtaining a packet delay, a packet loss, a packet length, and a jitter value for respective receiving gateways, and applying the packet delay, the packet loss, the packet length, and the jitter value to the equation for getting the prediction MOS value to obtain the prediction MOS values for each of the receiving gateways.
A call routing method in VoIP, the method comprising:
- a first step of obtaining, at an arbitrary gateway, a final prediction MOS (Mean Opinion Score) value by obtaining a prediction MOS value from an equation for getting a prediction MOS value, receiving a prediction MOS value from each of a plurality of receiving gateways, and obtaining the final prediction MOS value based on the prediction MOS value from the equation and the prediction MOS value that is transmitted from the plurality of receiving gateways;
- a second step of constructing, at the arbitrary gateway, a gateway routing table having designated gateway group table numbers in accordance with call routing access codes, and for constructing gateway group tables respectively corresponding to the gateway group table numbers each gateway group table having a gateway IP address field for each gateway in the corresponding gateway group and a prediction MOS value field for designating the final prediction MOS value respectively corresponding to each gateway IP address in the IP address field;
- and
- a third step, when performing a call routing to a gateway group according to an access code accompanying a call connection request, of performing, at the arbitrary gateway, the call routing to one of the receiving gateways having a prediction MOS value greater than the prediction MOS values of the other receiving gateways in the gateway group corresponding to the access code.
1 more element
Dependencies are inferred from the claim text.