Has anybody done any tests on sip hardphones quantitatively measuring the MOS and TELR value. I am doing some type approval testing and one of the requirements is that the measured echo is <= -25dB with a MOS value of 3.5. I dont know whether this -25dB value is fictitious or unachieveable or is there any settings that you need to do on asterisk side to attain that magic number
Regards
Rosli
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