[asterisk-users] echo cancellation on hard phones

[Rosli Sukri]

Dear List,
 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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