MMChapter 4, Features40 Aastra – 2568-004Step Action Result2. Repeat Step 1 to alternate betweencallsReturn to the Holding Party when One Party Hangs UpConditions:One party is disconnected, the other is still on holdStep Action Result1. PressOrPressExtension key lamp ONYou are in conversation with theheld partyCallbackThe Callback feature allows you to place a Callback on a busy internal extension or anextension that does not answer. The system automatically places the call when bothextensions are no longer busy.• When another party has left a callback on your phone, the softkey isdisplayed in the menu.• If a callback is left on a line other than your prime line, it will display only after youselect the line.• Each extension can have 10 callbacks.• Callbacks are returned on a first in/first out basis.• If you try to leave a callback on an extension that has already received 10 callbacks,you will hear a fast busy tone.• If there is no answer when you return a callback, you may either hang up and cancelthe call or leave a callback on that extension.• A callback that you place on another extension returns to your phone with a three-ring system ring when both your phone and the called extension are on hook. Thatcall is automatically canceled if you do not answer within a system-defined timeperiod.