Feature options: Feature options appear on the third line of the display.

Feature options vary, depending on the type of call or feature in use.

Handset icons: The following icons appear on the fourth line of the display:

(((.))) The radio signal icon indicates connection to system.

Note: The icon flashes when the system is busy and you will not be able to make or answer calls.

The envelope icon indicates a new text message (MSF-MAIL).

Left and right arrow icons

appear on the display when you access Handset option menus.

The telephone icon indicates a call is active.

Note: The icon flashes when a call connection is in progress.

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Nortel Networks 7420 manual