AT&T TRIMLINE TR1909 - Manual (Page 23)

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Telephone operation
Options while on calls
Flash
If you subscribe to call waiting service from your local
telephone service provider (see
About caller ID on
page 23), you hear a beep if someone calls while you
are already on a call. Press
FLASH on the handset to put your
current call on hold and take the new call. You can press FLASH
anytime to switch back and forth between calls and to activate
other telephone company subscriber services such as three-way
calling. Contact your telephone service provider for information on
subscriber services.
Mute
You can press and hold MUTE to silence the
microphone during a conversation. You can hear the
caller, but the caller does not hear you until you
release
MUTE to resume conversation.
Temporary tone dialing
This feature can temporarily switch from pulse to touch-tone dialing
during a call.
During a call, press TONE .
Use the dialing keys to enter the relevant number.
The telephone sends touch-tone signals.
The telephone automatically returns to pulse dialing
mode after you hang up.
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