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Call completion (P710)
Call completion means that when a called number is busy or not available, your phone will call you back as soon as the
dialed number is not busy anymore or available again. The factory default setting is "off".
Note: This function must be supported by your VoIP provider and/or your PBX.
On the phone
Press > > > . Call Features Outgoing Calls Call Completion
Select the setting and press to change it from to and vice versa.off on
Press briefly to return to the previous menu, press for two seconds to return to the idle screen.