At&t Mls 12d User Manual

Posted : admin On 10/6/2021
  1. At&t Mls-12d User Manual

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Telephone Buttons and Indicators



If you have problems with your phone, see
“Troubleshooting” in the Installation and Use manual,
or call our toll-free Helpline:

1 800 628-2888

Calling Feature Buttons

[MLS-12 only]

These four buttons, from left to right, are pressed to use

the following features: Privacy, Last Number Redial,
and Conference Drop. See p. 5.


MLS-12 Speakerphone Hint:

For convenient speakerphone operation, leave the
microphone on all the time (press [Mic] if the light
next to the button is off). When you receive a voice-
signaled call, you hear a beep and the person calling
can speak to you over your phone’s speaker. To
make and receive calls, press [Spkr]; this turns on
the microphone and your phone's speaker.

Auto Dial Buttons

Line Buttons

[MLS-12 only]
Stores outside Auto Dial numbers for dialing with one
touch. See p. 4.

Spkr (Speaker) Button

MLS-12: Press to dial and speak on your phone without
lifting the handset.When you press [Spkr], both the
speaker and the microphone come on (indicated by the
lights next to the [Spkr] and [Mic] buttons). You can hear
the phone ringing over your speaker, and when the party
on the other end answers, you can speak without lifting

Press to make or answer outside calls. Green and red
lights next to each button show what is happening on the
line. See 'Lights,' p. 4.

Intercom Buttons

the handset. MLS-6: Press to dial without lifting the

Press either button to make or answer an inside
(intercom) call to another extension.


Feature Button

Press to dial Speed Dial numbers (p. 1);to store Auto Dial
numbers (p. 4); and (on MLS-6 phones only) to access
the Last Number Redial, Recall, and Conference Drop

features (p. 5).

Conf (Conference) Button

Press to add other parties to your call (p. 6).

Transfer Button

Press to transfer an outside call to another extension (p. 6).

Hold Button

handset; when the party answers, lift the handset to

Mic (Microphone) Button

[MLS-12 only]

Press [Mic] to turn your phone’s microphone on or off (you
can press [Spkr] to turn both speaker and microphone on
with a single touch). The light next to the button shows
when the person on the other end of a call can hear you.

Message Indicator

Flashes to show settings while system programming.

Volume Control Buttons

Press to decrease ( ) or increase ( ) the volume of the

Press to put a call on hold (p. 6).

ringer, speaker, and handset.

To adjust ringer volume, while phone is idle and hand-

set is on the phone, press or .


To adjust speaker volume, press or while listen-

ing through the speaker.

To adjust handset earpiece volume, while listening on

a call, lift the handset and press or .



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Answering a Call

[ L i n e ] or

1 Press the flashing [Line] or [Intercom] button.

2 Lift the handset.

If you lift the handset without first pressing a line button, you will be

connected to the line ringing longest.

Joining a Call


To connect yourself to an outside call being con-

ducted at another extension:

1. Press the [Line] button (steady red light).

2. Lift the handset.

At&t mls-12d user manual

You cannot:

Join an intercom (inside) call

Join a conference call

Join a call when the other extension

has Privacy on.

U s i n g S p e c i a l


At&t Mls-12d User Manual

To use these features on an MLS-12 phone, press the calling feature button. To use on an

MLS-6 phone, press [Feature] plus 2-digit code.

How to Use
With MLS-6

How to Use
With MLS-12




Last Number


Not Available

Press [Privacy]
Press again to turn off

Press [Last Num]

Press [Feature] [0] [5]

Press [Feature] [0] [3] Press [Recall]


Press [Feature] [0] [6]

Press [Drop]


Prevents other people with the
same line from joining your
calls. A steady green light
shows Privacy is on.

Redials the last outside num-
ber you dialed. Useful for
redialing a busy number.

“Recalls” a dial tone, If you are
not on a PBX or Centrex, use
Recall to end a call without
hanging up - you will get a dial
tone and can then make
another call. Otherwise, use
Recall to get the PBX/Centrex
dial tone.

Drops the last party added to a
conference call.


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