# Line Types and Appearances

## Description

Line appearance keys are single or shared lines that appear on the telephone programmable keys (see Peripheral Devices).

There are three types of lines:

- Prime: The Prime line is the identifying extension number of the set and is associated with button number 1 of the device. (See the Keys tab in the User and Services Configuration form for button locations.)

- Non-Prime: A Non-Prime line is any line appearance that is not the Prime line.

- No Where Prime (Phantom Line): If a line is No Where Prime, the associated extension number does not appear as a Prime line appearance anywhere in the system. This type of line is also referred to as a Phantom line.

Each type of line is any of the following:

- Single line: The extension number appears only on one set.

- Key System line: The extension number appears on multiple sets; however, if one line appearance is in use, all other appearances are busy. When a call is placed on Hold, any line appearance can retrieve the call. See Groups Key System and Multicall for more information.

- Multicall line: The extension number appears on multiple sets, and if one line appearance is in use, all other appearances of the line are idle. When a call is placed on Hold, only the originating set can retrieve the call. See Groups Key System and Multicall for more information.

- Direct Trunk Select (DTS) line: The appearance provides direct access to an outside trunk. A DTS Line can either be a Single Line or a Key System line, but it cannot be a Prime line. See Trunk Select - Direct for more information.

## Conditions and Feature Interactions

- Refer to Groups Key System and Multicall and Trunk Select Direct.

- See also Line Status: Multi-Color (LED) Indication

## Programming

Refer to Groups Key System and Multicall and Trunk Select Direct.

## Device Support

- Supported on all devices.

## Operation

#### All Mitel telephones

To initiate a call on the Prime line:

1. Lift handset.

2. Dial the number.

To answer a call on the Prime line:

- Lift the handset.

#### All Mitel multi-line telephones

To initiate a call on a Non-Prime line:

1. Lift handset.

2. Press the appropriate line appearance key.

3. Dial the number.

To answer a call on a Non-Prime line:

1. Lift handset.

2. Press the flashing line appearance key.