On The Echo Canceler - Sony PCS-1600 Operating Instructions Manual

Adjusting the Sound
When you use the lip synchronization, set Lip Sync to On in
the Audio Setup menu. When you do not use the lip
synchronization, set it to Off.
For details on the Lip Sync setting, see "Audio Setup menu" on
page 97.
Note
The lip synchronization function only works for your own
party. To activate the lip synchronization function at the remote
party, you must ask them to do so.

On the Echo canceler

The Compact Processor is equipped with the echo canceler.
When you use the built-in echo canceler, set Echo Canceler to
Internal in the Audio Setup menu; when not in use, set to Off.
If you use an echo canceler of external audio equipment
connected to the system, set Echo Canceler to External. It
should normally be set to On.
For details on the Echo Canceler setting, see "Audio Setup
menu" on page 97.
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Chapter 2 Basic Operation During a Meeting