Pirelli DISCUS DP-L10 - Manual (Page 41)

Chapter
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3.3.2 Multi call connected mode
During a call, the user can accept another incoming call or make another
outgoing call. In this case, the screen will be in multi-connected mode. As in
the following example, with one call active, and the other on hold, the user can
also combine two GSM calls into one conference call, as shown in later
section.
A connected call can accept any incoming calls; the user can also make a new
call in connected mode. DP-L10 would auto make 2 calls into multi-connected
mode, one call is on line, another on hold, unless user makes two GSM calls
into one conference call.
a) Two GSM calls in multi mode
A GSM connected call > Alan incoming > 2 GSM > multi-call > Green key
to Swap call >mute
Reject a call will show the Call end on Pop-up window