AT&T 993 2-Line - Manual (Page 39)

Telephone operation
36
Options while on calls
Mute
Mute allows you to hear the other party, but the other
party cannot hear you.
To activate this feature, press and release MUTE. The
MUTE light goes on.
To return to the conversation, press and release MUTE
again.
NOTE: Switching from handset to speakerphone or headset, or from
speakerphone or headset to handset, changing lines, and putting a
call on hold will cancel Mute.
Flash
Use FLASH instead of the switchhook to activate
telephone service provider subscriber services such as call
waiting or three-way calling.
NOTE: During a conference call, flash works only on Line .
Conference calls
You can use both lines at the same time to set up a
three-way conference call.
When on a call, press HOLD.
Establish a call on the other line.
Press
CONFERENCE. All three parties are connected
to the same call.
To end a conference call, hang up.
If one caller hangs up during a conference call, there may
be a dial tone. Press the
LINE button of the remaining call
to disconnect the other line and eliminate the dial tone.
NOTE: Under certain circumstances, the other parties on a
conference call may not hear one another clearly.
Place a conference call on hold
Press HOLD to hold both lines.
Press CONFERENCE to release hold and continue the
conference call.
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