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System Telephones
This guide refers to AT&T telephones specifically designed to work with the
system as system phones. These include the MLS-34D, MLS-18D, MLS-12D,
MLS-12, MLS-6, and MLC-6 telephones.
System phones have several buttons in common: volume control buttons, and
the [
Feature ], [ Conf ], [ Transfer ], and [ Hold ] buttons. In addition, each phone has
programmable buttons that can be used for outside lines, extension numbers,
outside phone numbers, or system features. Outside lines, as well as some
system features, require buttons with status lights. Programmable buttons
without lines assigned to them can be programmed with numbers or features, so
you can use the feature or dial the number with one touch. The number in each
model name indicates the number of programmable buttons with status lights
plus two [
Intercom ] buttons.
If the system phone has a display, indicated by a “D” in the model name, users
receive messages and prompts when making calls and programming. (More
information about the display is provided in Chapter 5.) A system display phone
is required for system programming. It must be as large as the largest phone in
the system, since an MLS-12D or MLS-18D cannot program an MLS-34D.
Similarly, an MLS-12D cannot program an MLS-18D.
Table 1-1 summarizes system phone features.
Table 1-1. System Phones
MLS-34D MLS-18D
MLS-12D
MLS-12
MLS-6
MLC-6
Total Number of
Programmable Buttons
32
16
16
16
4
4
Line Capacity (Number of
Programmable Buttons with
24*
16
10
10
4 4
Status Lights)
Intercom Buttons
2
2 2 2 2 2
Display
✔
✔ ✔
— —
—
Speaker
✔
✔
✔
✔ ✔
—
Microphone
✔
✔ ✔ ✔
— —
✶
The MLS-34D has 32 programmable buttons with status lights. Since the system supports a maximum of 24
lines, up to 24 buttons on the MLS-34D can be used for outside lines.
Overview
1-5