Telephone operation
Volume 
control
Options while on calls
Volume control
Press the VOLUME 
keys on the side of the handset to adjust the listening volume. Each press of the button increases or decreases the volume level.
NOTES:
1.All volume settings, (normal handset, speakerphone, and headset) are independent.
2.When the volume reaches the minimum or maximum setting, you will hear two beeps.
Call waiting
If you subscribe to call waiting service with your local telephone service provider, you will hear a beep if someone calls while you are already on a call. Press 
PHONE/FLASH to put your current call on hold and take the new call. You can press 
PHONE/FLASH at any time to switch back and forth between calls.
Multiple handset use (not for model SL81108)
If a handset is already on a call and you’d like to join the call, press 
PHONE/FLASH or 
SPEAKER on another system handset.
Press 
OFF/CLEAR or place the handset in the telephone base or charger to exit the call. The call will not be terminated until all handsets hang up.
NOTE: Only two system handsets can be used at the same time on an outside call.
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