AT&T TL96477 - Multiple Handset Use; Join a Call in Progress

Another handset or the telephone base can join you on an outside call. The
call continues until all people hang up. You can share an outside call with the
telephone base and up to four system handsets.
To join a home call:
Using a handset:
f Press HOME/FLASH or /SPEAKER on another handset to join the call.
Using the telephone base:
f Press HOME to join the call.
To join a cell call:
Using a handset:
f Press CELL 1 or CELL 2 on another handset to join the call.
Using the telephone base:
f Press CELL 1 or CELL 2 to join the call.
Join a call in progress
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Multiple handset use