AT&T CL83215 - Multiple Handset Use; Handset Management

Telephone operation
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Volume control
Using a cordless handset:
You can set the listening volume to one of six levels.
While on a call, press qCID/VOLUME to decrease or
press pDIR/VOLUME to increase the listening volume.
Using the telephone base:
You can set the listening volume to one of eight levels.
While on a call, press q/VOLUME to decrease or
VOLUME/p to increase the listening volume.
NOTES:
Handset and speakerphone volume settings are independent.
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 or PTT/FLASH on the telephone
base to put your current call on hold and take the new call.
Press PHONE/FLASH on your handset or PTT/FLASH on your telephone
base 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