General FeaturesFeatures Guide 35Button, Loop-CO (L-CO)DescriptionAll outside lines can be assigned to a flexible CO button on a proprietary telephone (PT). Theassigned button serves as a Loop-CO (L-CO) button. An incoming call on any outside linearrives at the L-CO, unless there are Single-CO (S-CO) or Group-CO (G-CO) buttonsassociated with the line or unless the button is already in use. To make an outside call, the PTuser simply press the dedicated L-CO button.Conditions• No L-CO button is originally provided on a PT. A flexible CO button can be assigned as anL-CO button in either System or Station Programming.• It is possible to assign more than one L-CO button on a PT.• Pressing the L-CO button provides the same operation as dialing an automatic line accesscode. This results in Automatic Line Access or Automatic Route Selection (ARS), ifprogrammed.• Immediate, delayed, no ringing or no incoming call (disable) can be selected on anextension—outside line basis.• The digital PT user can choose a desired ringer frequency for each L-CO button by Systemor Station Programming.Programming Guide References• [005] Flexible CO Button Assignment• [400] Outside Line Connection Assignment• [603-604] DIL 1:N Extension and Delayed Ringing —— Day / Night• [605-606] Outgoing Permitted Outside Line Assignment —— Day / NightFeatures Guide References• Answering, Direct Outside Line• LED Indication, Outside Line• Line Access, Automatic• Line Access, Direct• Ringing, Delayed• Ringing Tone Selection for CO ButtonsUser Manual References• 2.2.2 Flexible Button Assignment• 2.2.4 Ringing Tone Selection for CO Buttons• 4.2.1 Making Calls• 4.2.2 Receiving Calls• 4.3.64 Outward Dialing, Line Access — SUMMARY
