General FeaturesFeatures Guide 159Intercom CallingDescriptionAllows the extension user to call another extension user within the system.Conditions• Extension numbers are assigned to all extensions by System Programming. An extensionnumber is programmed to be two, three, or four digits.• Names can be given to extension numbers by System Programming. An extension numberand a name, if programmed, is shown on the display proprietary telephone during anintercom call.• DSS (Direct Station Selection) buttons permit one-touch access to an extension and provideBusy Lamp Field.• KX-T7431, KX-T7433, KX-T7436 and KX-T7235 users can make an extension call withan extension dialing directory on the display.• After dialing an extension number, the user will hear one of the following:Ringback tone: indicates the other extension is being called.Confirmation tone: indicates the user can perform Voice Calling.Busy tone: indicates the other extension is busy.Do Not Disturb (DND) tone: indicates the other extension has DND assigned.Programming Guide References• [003] Extension Number Set• [004] Extension Name Set• [005] Flexible CO Button Assignment• [012] ISDN Extension Number Set• [013] ISDN Extension Name Set• [100] Flexible NumberingFeatures Guide References• Busy Lamp Field• Button, Direct Station Selection (DSS)User Manual References• 2.2.2 Flexible Button Assignment• 4.3.52 Intercom Calling
