LG C3400 Guide De L'utilisateur page 31

In call Menu
2-8 A Private Call in a Multiparty Call
To have a private call with one caller of a multiparty call, display the
number of the caller you wish to talk to on the screen, then select
< [Options] and Multiparty / Private to put all the other callers on
hold.
2-9 Ending a Multiparty Call
The currently displayed caller of a multiparty call can be
disconnected by pressing the E [End] key. To end a multiparty
call, press < [Options] then select Multiparty / End multiparty.
Selecting < [Options] then Multiparty / End all, will end all the
active and held calls.
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