You can get acoustic echo by adding latency. This is the handset mic
picking up the handset speaker, and it doesn't happen on POTS lines, but
it happens on VoIP using the exact same phone because the up and down
path are no longer synchronous.
There are also electrical echo effects that are above my pay grade. One
of the old phone guys here maybe knows something.
My understanding is that echo cancellation can detect and fix the
electrical echos, but not the acoustic echo. To fix acoustic echo you
either turn down the volume on the handset or use a different handset.
------ Original Message ------
From: "Chris Fabien" <[email protected]>
To: [email protected]
Sent: 2/17/2018 6:09:32 PM
Subject: [AFMUG] How to create echo on an analog tel line
We are having sporadic reports of our subscriber hearing an echo on
some new go up ATA we are usin g. Whenever I test it myself with
various phones, it's fine. Anyone know how I can create this condition
so I can fool with the echo cancellation gains to see if I can fix it?
