AT&T CL82215 - Options While on Calls; Volume Control; Call Waiting

Telephone operation
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Volume control
You can set the listening volume to one of six
levels. While on a call, press 
CID/VOLUME to
decrease or press 
DIR/VOLUME to increase
the listening volume.
NOTES:
Handset and speakerphone volume settings are independ-
ent.
When the volume reaches the minimum or maximum setting, you hear two beeps.
Call waiting
If you subscribe to call waiting service from your telephone service
provider, and someone calls while you are already on a call, you
hear two beeps.
Press
PHONE/FLASH on the handset to put your current call on
hold and take the new call.
Press
PHONE/FLASH on your handset at any time to switch
back and forth between calls.
NOTE: Missed call waiting calls are not counted as missed calls.
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Options while on calls