AT&T E2812B User Manual page 17

Telephone operation
Options while on calls
Multiple handset use
While on a call, a person on the other handset can
press PHONE or SPEAKER to join the
/FLASH
same conversation.
A person on either handset can press OFF ,
/CLEAR
or place the handset in the telephone base or
charger to drop out of the call, but the call will not
be terminated until both handsets hang up.
NOTE: When two handsets are used on the same outside
call, the call transfer feature cannot be used (page 16).
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