Echo is usually excessive delay and /or jitter/packet loss.
If you've got a 7940/60/70 press the '?' between the 4 buttons twice quickly during a call. It will give you some statistics to look at for voice quality. If it's a L3 problem it's just a matter of tracking down where it's at. You can track it down just using 'show interface' and pings and such to figure out where the traffic is getting dropped.
Normally echo is seen when going to the PSTN, so you want to make sure that this is happening IP phone to IP phone.
If it is, upgrade the phones to the latest firmware.
Tell them to take off their headsets as well. Recent issue with 8.4.1 phone loads with echo on some wireless headsets. Need to lower the mic volume of the headsets for that.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...