Patent ID: 7907523

Claim:
A variable bit-rate voice codec control apparatus for terminals connected to a network with a variable bit-rate voice codec, the variable bit rate voice codec control apparatus comprising: a terminal information extraction unit extracting calling capability of the terminals which request a new call to be made; a call quality monitor extracting network parameters from an existing call in the network through an exchanged packet and measuring voice quality of the existing call based on the extracted network parameters; and an admission policy unit determining whether to permit the new call to be made based on the measured voice quality and the extracted calling capability, wherein the admission policy unit further comprises a bandwidth estimation unit estimating an available bandwidth of the network based on the measured voice quality; an admission unit permitting the new call to be made when the available bandwidth satisfies a condition needed for making the new call; a bandwidth adjustment determining unit determining whether it is possible to provide a bandwidth needed for making the new call by adjusting the bandwidth of the existing call, when the available bandwidth does not satisfy the condition needed for making the new call; and a bit-rate selection unit selecting a changed codec bit-rate lower than the codec bit-rate of the existing call, when it is possible to provide the bandwidth needed for making the new call; and an admission controller allocating a bandwidth corresponding to the maximum transmission bit-rate of the terminals that request the new call to be made.