Section 700 - Operation Chapter 5. Key Telephone FeaturesICX-40-700 ICX (International) issued December 1999 5-11To use Extension Busy Override:Considerations• You cannot break in on three-party conference calls.• The default for the Override Alert Tone is off . If the Override Alert Tone is enabled, the tone willbe sent to both parties when a call is overridden.• Beginning with Version 4.0 and higher, certain extensions can be excluded from busy overridebased on Class of Service.Callback RequestDescriptionIf you dial a busy extension, Callback Request enables the System to call you back when thatextension becomes free. When you answer, the System automatically rings the called party again.OperationTo set a Callback Request:Action Result1. Lift the handset or press the ON/OFF key. Intercom dial tone2. Dial the extension number. • Dialed extension number displays• Busy tone3. Enter the Busy Override code (default = 9(UK/HK) or0(TW)).• Alert tone sounds to both extensions(System programming required)• Connection to both parties• OVR1: (name of overriding exten-sion) and OVR2: (extension namefor current talk path) displays onboth extensionsAction Result1. Lift the handset or press the ON/OFF key. Intercom dial tone2. Dial the extension number. • Dialed extension number displays• Busy tone3. Enter the Callback Request code (default = 3(UK/HK) or3#).Ringback tone4. Replace the handset after you hear the ringback tone. System calls back when called extensionbecomes free
