Programming instructions

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DX-120 Programming Manual BASIC SYSTEM PROGRAMMING TASKS
Phantom Lines / Virtual Numbers
Phantom lines (i.e., virtual numbers) are software resources that act as placement mechanisms for call processing.
• CO line and intercom calls can be routed to phantom lines where they can be accessed by any extension that has
an appearance (button) for that phantom line.
• If internal call routing requires a connection (CO line or intercom) to be placed in a general access location,
phantom lines can be a good solution.
• Phantom lines do not ring.
• The system indicates a call at a phantom line by fast flashing the associated LED only.
• Calls that are connected to phantom lines are usually announced using the page feature for proper pickup.
• You must program phantom lines onto Feature Keys (see “Assigning Feature Keys” on page 442).
• If no appearance of the phantom line exists in the system, the user attempting to call the phantom line or transfer
a call to the phantom line will receive error tone and OUT OF SERVICE will appear on the display:
• Phantom lines/virtual numbers are set up within the Numbering Plan (see “Customizing the Numbering Plan” on
page 103)