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Direct Station Selector Feature

Considerations and Constraints

One or two DSSs can be connected to a 4424D+, 4424LD+, MLX-20L, or MLX- 28D telephone. DSSs cannot be connected to a 4400, 4400D, 4406D+, 4412D+, MLX-5, MLX-5D, MLX-10, MLX-10DP, MLX-10D, MLX-16DP, ETR, or MLS telephone.

The DSS (for MLX telephones) and the DSS 4450 (for multiline 4400-Series telephones) cannot be interchanged.

Only a DLC or QCC can have a DSS.

Operator Park Zone codes must be included in the extension number range specified for one of the Page buttons.

The LEDs on a DSS change during programming:

• If a local extension is busy because features are being assigned through system or centralized telephone programming, the red LED next to the associated DSS button is on to indicate the busy condition. This occurs when the telephone with the attached DSS is not the one being programmed.
  
  
• When you enter centralized telephone programming or extension programming to program the telephone you are on, the LEDs on the DSS(s) attached to the telephone turn off, except for the last two rows of buttons on the DSS(s). This also occurs when you program another telephone through centralized telephone programming: the LEDs on the DSS(s) attached to your telephone turn off, except for the last two rows of buttons.
  
  
• When a telephone is being programmed by someone at the system programming console, all the LEDs (including the last two rows) turn off on the DSS(s) attached to the telephone being programmed.
  
  
• When you program a telephone with an attached DSS from another extension, all the LEDs on the DSS turn off, including the bottom two rows, during programming mode.

When a QCC is active on a call, pressing a DSS button for a line/trunk number, LDN, or unassigned extension number is ignored.

A call to a non-local dial plan extension, using a DSS button at a QCC, will be automatically transferred if the extended call completion option at the QCC is programmed for Automatic Completion. If the QCC is not programmed for Automatic Completion, hangup or depression of the Release button completes the transfer. In both of the above situations, the call will be callback queued if no facilities associated with the route are available. Local dial plan extension transferring is not changed.

 

	SECURITY ALERT!
	Do not include the ARS access code in the non-local dial plan.

When a call is forwarded to a multiline telephone that has a DSS button for the forwarding telephone, the light next to the DSS button does not flash.

The DSS 4450 (used with the 4424D+ and 4424LD+ telephones) requires local power. If the DSS 4450 is attached to a 4424LD+ telephone, it uses the power from that telephone's power supply. If the DSS is attached to a 4424D+ telephone, you must order a power supply for the DSS 4450.

DSSs connected to MLX telephones that are out of the building require additional local power. Any console with two DSSs requires local power.

If you move a telephone with an attached DSS to an extension not programmed as a DLC or QCC, the telephone (or the DSS?) does not work.

Topics
	1.htmDescription
	Normal Call-Handling Operation Calling Group Supervisory Operation Extension Status Operation (Hotel Configuration) Message Status Operation
	At a Glance
	Considerations & Constraints
	System Programming
	Mode Differences
	Feature Interactions