IP Telephony and Phones

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Hi guys.I have this issue when some of the calls placed in a E1 have echo.What I have be done so far is to change the command "echo-cancel coverage 24" to the values 128, 96, 24, under the E1 voice port config.But still nothing.Any ideas are welcome

I'm running Cisco CallManager System version: 8.6.2.25900-8 on our envirment and we are in the process of deplying a Cisco 8811 phone.Step i took Install Device PackReset TFTP servicesconfigure the cisco 8811 ph howevergetting error messageTelephone ...