Evaluation voice quality standard of E - the model of the international telecommunication union, can accurately packet loss distribution and end user feel model is set up, the packet loss and delay distribution and encoder, to give a single score, this method is considered in the data network voice quality assessment is quite accuracy, but as ITU -t g. 107 specification mentioned in the beginning of the "the purpose of this assessment is only used for transmission design, not to the actual user evaluation forecast," E - a considerable number of possible combinations of input parameter model situation has not been tested enough limits and adequate laboratory measurements,
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