Idle Line Preference determines the user's currently selected button as the first available idle call/line appearance button. Selected button indication is applied to that button and if the user goes off-hook, for example by lifting their handset, an outgoing call is started on that button.
?Why Would I Use Just Idle Line Preference In environments that are focused on making outgoing calls, for example telemarketing, incoming calls are infrequent and user's go off-hook expecting to make a call. Using Idle Line Preference without Ringing Line Preference ensures that the user doesn't inadvertently answer a call when expecting to make a call.
If all the available call/line appearance buttons are in use, no current selected button choice is made by Idle Line Preference. In this case, going off hook will have no effect.
For appearance button users with Idle Line Preference off, going off-hook (lifting the handset or pressing SPEAKER, HEADSET, etc) will have no effect until an appearance button is pressed.
By default Idle Line Preference is on for all users.
Idle Line Preference is overridden by Ringing Line Preference if also on for the user.