AT&T CLP99587 - Multiple Handset Use; Join a Call in Progress

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