FLY SL400 User Manual page 27

Conference*
Enter conference call status, answer the phone and add it to
conference call according to the prompt; hold conference call; make
private conversation with one party of the conference, while hold
conversation with all other parties; end current call and all held calls.
Note: Menu items marked with * only appear in certain
circumstance. For example, "switch" only appears when there is
talking call and held call at the same time. You need to apply to
network service provider to enable conference talk function.
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