Terms you should know More. The More Key allows access to the multiple layers of Programmable Soft Keys. These keys are the keys located below the display on your telephone. Off-hook Off-hook is a term used to indicate that the telephone is active and ready to make a call. Your telephones status changes to off-hook when you pick up the handset or press a Line (DN) Key. Paging tonePaging tone is a special tone heard when using the Radio Paging feature. You hear two beeps followed by dial tone. Personal Directory The Personal Directory stores entries by name and phone number. Primary Directory Number The Primary Directory Number is the main extension number on your telephone. It is accessed through the Primary Directory Number (PDN) Key. Private Line Private Line can be assigned to your telephone. With this line, you can reach an outside number without dialing a code to access an outside line. Internal extensions cannot be dialed from a private line. Redial List The Redial List is accessed through the Call Log Key on the M3903 and through the Directory/Log Key on the M3904. It lists outgoing numbers for calls that have been made from your telephone. Ringback/ring tone Ringback/ring tone is the sound you hear when a call you have made is ringing at its destination. Shared Directory Number A shared Directory Number is a DN (extension) that is shared by two or more telephones. This is also known as a Multiple Appearance DN (MADN). Special dial tone The special dial tone refers to three consecutive short tones followed by steady dial tone that you hear when accessing some of your telephone features. Switchhook The switchhook is the button which the handset presses down, disconnecting your call, when you replace the handset. When lifted, the handset releases the switchhook and you either answer an incoming call or you receive dial tone indicating that your telephone is ready to make a call.
Your telephone call features
Your network administrator assigns features to your programmable feature keys. Whenever this guide describes a procedure that requires special codes ask your network administrator to provide these to you. To access a feature, you press a Feature Key, or enter a Flexible Feature Code (FFC) for the Meridian 1 or a Feature Access Code (FAC) for the Meridian SL-100. Your network administrator supplies you with the Flexible Feature Codes or Feature Access Codes for your system. Note: In order to use a feature described in this section, your system software must support the feature and the feature must be assigned to your telephone. Check with your network administrator for more details.

Group listening Select 3. Press the Select Key.

4. Press the On Key.

5. Press the Handsfree Key. Everyone will hear the caller over the speaker, but the caller will only hear what is picked up by the handset. Note: You must tell the caller that others are listening to the conversation because Group listening does not alert the caller that the conversation is being monitored.
To deactivate Group listening controls:
1. Press the Options Key.
2. Use the up and down Navigation Keys to scroll through the menu and highlight Group listening. Group listening 12
Your telephone call features 3. Press the Select Key.

Select

4. Press the Off Key to turn Group listening off. 5. Press the Done Key to save changes.
6. Press the Quit Key to exit.
To mute a group listening call:
1. Press the Mute Key. The LED flashes. 2. Press the Mute Key again to return to two way conversation.
To switch from Group listening to handsfree:
Hold down the Speaker Key while replacing the handset. and Note 1: The Group listening feature must be configured for your telephone by your network administrator. Activate the feature through the Options List to use Group listening. Note 2: You must let the other party know when others are listening to the conversation. This feature does not have a tone to inform the party on the other end of the call that the conversation is being monitored.
Use the Redial list on the M3903
The Redial List records the outgoing call numbers.
To access the Redial list on the M3903:
1. Press the Call Log Key.
2. Use the up and down Navigation Keys to highlight Redial List. Redial List Select 3. Press the Select Key.

To use the Redial list:

1. Use the up and down Navigation Keys to scroll through the Redial List and highlight the number you want to call. Note: If you are calling an external or long distance number, be sure that the appropriate access codes are included.
2. Press the Dial Key. Your call is automatically dialed and you exit the Redial List.
Use the Redial List on the M3904
To access the Redial List on the M3904:
1. Press the Directory/Log Key.

3. Press the Speed Call Controller Key again to save the code and number. The flashing icon turns off.

To make a Speed Call:

1. Lift the handset. 2. Press the Speed Call Controller key or the Speed Call User Key. 3. Dial the Speed Call code.

SpcUser

Make a System Speed Call
System Speed Call allows you to make a call by dialing Speed Call codes which may override your telephones class of service restrictions. The System Speed Call feature is set up on the system by your network administrator. It is a speed dial number that is common to many users, therefore it is set up on the system not on your individual telephone.
To make a System Speed Call:

1. Lift the handset.

SScCtlr

SScUser

2. Press the System Speed Call Controller key or the System Speed Call User Key. 3. Dial the Speed Call code of the number you want to dial. The number is automatically dialed.

Use Hot Line

The network administrator can program a Hot Line Key that allows you to dial a specific number automatically. The network administrator can apply other features to the Hot Line such as Call Redirection, so that the Hot Line call is answered by a person and not by a voice mail box.

To use Hot Line:

Hotline
Press the Hot Line Key. The Hot Line Key automatically dials the number. Note 1: On the Meridian SL-100 system, the Automatic Line (AUL) feature is the same as the Hot Line feature. Note 2: If your main DN is a Hot Line, lift the handset. The Hot Line dials the number automatically.

Make an Intercom call

The Intercom feature connects a group of people together through an Intercom Key. You can use the Intercom feature to call a member of your intercom group by pressing a code assigned to each member of the group. The intercom group must be set up by your network administrator.
To make an Intercom call:
1. Lift the handset. 2. Press the Intercom Key. 3. Dial the one or two digit code for the intercom group member you wish to call.
To answer an Intercom call while on a line other than your Intercom group line:

Intercom

1. Press the Hold Key to put the current call on hold. or Press the Goodbye Key to end the call. 2. Press the Intercom Key and begin to speak.

Answer a call

When you receive an incoming call, your telephone rings and the LCD indicator flashes.

To answer a call:

Lift the handset. or or Press the Handfree Button located on the left side of the handset (M3902, M3903, and M3904). or 2498 or

Record a Calling Party Number
Calling Party Number allows you to record a callers number, for accounting purposes, while on an established call.
To record a callers number:

CParty

1. While on an active call, press the Calling Party Key. Enter number appears on the display. 2. Dial the calling partys telephone number.
3. Press the Calling Party Key.

Display incoming calls

The Display Key allows you to be on an active call and display an incoming callers name and/or number, if not automatically displayed, without interfering with the call in progress.
To view the name of a second caller while on a call in progress:

Display 2498

1. Press the Display Key. 2. Press the flashing Line (DN) Key. The call waiting information appears on the display. Note 1: Use of the Display Key does not interfere with the call in progress. Note 2: You can use the Display Key in combination with other feature keys to display information associated with the feature. Note 3: On the Meridian SL-100, while on an active call, press the Inspect Key to view information on an incoming call.

Trace a Malicious call

Malicious Call Trace provides a way for you to trace nuisance calls within your system.
To use Call Trace while you are on a call:

CallTrace

Press the Call Trace Key. Note: On the Meridian SL-100, press the Malicious Call Hold (MCH) Key.
To use Call Trace if you do not have a trace button:
1. Press the Transfer Key or the Conference Key. Note: On the Meridian SL-100, press only the Transfer Key.
2. Dial the Trace FFC (Meridian 1 system) or the Trace FAC (Meridian SL-100 system). 3. Press the Line (DN) Key beside the flashing LCD indicator to return to the call.
This section describes features that you can use with incoming calls.
Activate Automatic Answerback
When Automatic Answerback is active, your set automatically answers in handsfree mode after one ring. Note: When Automatic Answerback is active, calls do not forward to your voice message service.
To use Automatic Answerback:

AutoAns

To deactivate Automatic Answerback:
Press the Automatic Answerback Key.

Activate Call Pickup

Call Pickup allows you to pick up a call from any telephone in the same Pickup Group or another Pickup Group.
To answer a call in your own Call Pickup Group:
1. Lift the handset. Pickup 2. Press the Pickup Key.
To answer an incoming call in another Call Pickup Group:

1. Lift the handset. GrpPickup 2. Press the Group Pickup Key. 3. Dial the Pickup Group number of the telephone that is ringing. Note 1: The network administrator assigns the Pickup Group code. Note 2: This feature is not applicable on the Meridian SL-100 system.
To answer a call at a specific extension within your Pickup Group:
1. Lift the handset. DNPickup 2. Press the DN Pickup Key. Note 1: The Meridian SL-100 uses the Directed Call Pickup Feature Access Code (FAC). Note 2: If the pickup DN is invalid, you receive an overflow burst tone, and the screen displays Release and try again. Press the Goodbye Key. 33

Use Call Waiting

Call Waiting puts your current call on hold, while you answer an incoming call. Example: The attendant routes an outside call to you while you are on an existing call. Call Waiting allows you to recognize the call and respond to it. This feature must be enabled by your network administrator.
To answer an incoming call while on another call:
1. Press the Hold Key when you hear the tone. The Call Waiting status icon appears in the display. 2. Press the Call Wait Key (CWait for M3902) to answer the call.
To return to your first telephone call:
1. Press the Hold Key, if you want to put the second call on hold. or Press the Goodbye Key to end the second call. 2. Press the Line (DN) Key associated with the first call.
If you do not have a Call Waiting Key:
1. If you do not have a Call Waiting Key and you hear the Call Waiting tone, press the Goodbye Key to end your current call. 2. Press the Line (DN) Key beside the flashing status icon to answer the incoming call.
This section describes features that you may wish to use when you are away from your desk.

Forward calls

Call Forward allows you to direct your calls to ring at another DN. If the telephone is in the process of ringing, you cannot forward that call.
To forward your calls or change the forward number:

Forward

1. Press the Forward Key.
2. Dial the DN where you want to forward your calls. Forward 3. Press the Forward Key.

To cancel Call Forward:

Press the Forward Key.
To reinstate Call Forward to the same number:
Press the Forward Key Twice.
Forward internal calls only
Internal Call Forward allows only calls originating at internal DNs to ring at another DN. Calls originating outside your Meridian 1 system will still ring at your telephone. You cannot forward calls while your telephone is ringing.
To forward your internal calls:

IntForward

To use Auto Dial Transfer when you pick up an incoming trunk call:

CentrexSHF AutoDial

1. Press the Centrex Switchhook Flash Key and wait for interrupted dial tone. 2. Press the Auto Dial Key to call the number desired.
3. Press the Goodbye Key to end the call. Note: On the Meridian SL-100, Auto Dial can be used to transfer calls however, you do not have to be on a central office trunk call, and the Centrex Switchhook Flash key is not applicable to the Meridian SL-100.

Use the buzz signal

Buzz allows one person, whose telephone is linked to another telephone, to signal the other telephone. The person signaled hears a buzz. Use this feature to notify the other person of a call, a visitor, or a request.
To buzz the telephone linked to yours:
1. Press the Buzz Key. The telephone linked to yours, buzzes as long as you hold down the key.
2. When you are finished, release the Buzz Key. Note: Buzz signal is not available on the Meridian SL-100.
Call Page to make an announcement
Call Page allows you to make an announcement over the page system. To make a page call, dial the page trunk access code. Note: When the Page Key is used on an attendant console it overrides the telephones; the telephones are disconnected and must re-access the page trunk.
To connect to the page system:
1. Lift the handset. 2. Dial the page trunk access code. The connection to the page system is complete. 3. Make your announcement.
To disconnect from the page system:

Press the Goodbye Key.

Centrex/Exchange Switchhook Flash
Centrex/Exchange Switchhook Flash allows you to signal the Central Office/Exchange (CO) during an established call to use a Centrex service such as call transfer or three-way calling.
To use Centrex/Exchange Line Switchhook Flash:

CentrexSHF

1. Press the Centrex Switchhook Flash Key You receive special dial tone. 2. Dial the codes for your custom Centrex feature.
3. Press the Goodbye Key to end the call. Note: The Meridian SL-100 is a central office based PBX, and this feature is not available.
Charge a call or Forced Charge a call
Call Charge allows you to charge a call to a specific account. Forced Charge allows you to charge long-distance calls from a telephone restricted to local calls. Note: On the Meridian SL-100, the account code allows a user to enter a billing number. If the account code is required, the user is prompted to enter a code by a tone after the telephone number is dialed. If a user wishes to voluntarily enter an account code, then flash the switchhook and enter the feature code, which is provided by your network administrator.

To use Automatic Pre-selection (Meet - me page):
Additional Call Features 2. Dial the Radio Page FFC. You receive page dial tone. 3. Dial the number of the party you want to page. After you dial, you receive a ringback tone. Note 1: The person you paged uses any telephone to enter a Radio Page Answer code, plus their own DN. This action connects you and the person paged. Note 2: If your call goes unanswered for a preset time period, you receive a continuous high pitched tone then silence. Press the Goodbye Key.
To use Automatic Post selection:
The called party is either busy on the telephone or away from the desk. To page the called party there is no need to redial the number of the called party.

RadioPage

1. Press the Radio Page Key. You receive a special dial tone. 2. Dial the Radio Page Access FFC. You receive dial tone. Note 1: The person you have paged can proceed to any telephone, enter their Radio Page Answer code plus their own DN. This action connects you and the person paged. Note 2: You receive a fifteen second, high pitched tone, then silence if the party paged does not answer the call within a preset time period. When you receive this signal, replace the handset or press the Goodbye Key.
To use the Special Radio Page feature:
If you carry a Radio Pager, you receive a page indication when someone dials your DN.
Additional Call Features If the Radio Page system is set up to function in Meet - me mode, you can answer the page call from any telephone. You can connect to the person who paged you. 1. Lift the handset. 2. Dial the Radio Page Answer FFC. You receive page tone. 3. Dial your own DN. You connect to the page caller. You receive a steady high-pitched tone, letting you know the caller has hung up.

Voice Call Feature

You page another person or make an announcement through someone elses telephone speaker.

To make a voice call:

1. Lift the handset. 2. Press the Voice Call Key. 3. Make your announcement.

VoiceCall

4. Press the Goodbye Key.
To respond to a voice call:
Your telephone rings once and you hear the caller's voice through your speaker. Lift the handset. Note: On the Meridian SL-100 use the Individual Page from the Group Intercom (GIC) feature. Press the GIC Key and dial the appropriate GIC number. After the first ring, press the GIC Key and a one-way connection is established. Make your announcement over the speaker. 53
These hospitality features are intended for hotel operations use. Note: With the exception of Automatic Wake-Up, hospitality features are not available on the Meridian SL-100.

Automatic Wake-Up

Although normally used as a hotel feature, Automatic Wake-Up may be useful to business users who require a timed reminder call feature. From your telephone you may program the Meridian 1 system to automatically place a call to you at a predetermined time. When you answer the call, you hear recorded music for up to thirty seconds followed by a pre-recorded announcement, or the attendant.
To enter the time for a wake-up call:
1. Lift the handset. 2. Dial the Wake-Up Request FFC on the Meridian 1 or the Wake-Up Request FAC on the Meridian SL-100. 3. Dial the wake-up time in a 24-hour format (hhmm).
4. Press the Goodbye Key. Note: On the Meridian SL-100, after you enter the FAC, you receive a second dial tone. Enter four consecutive digits to specify an hour and minute. The reminder time is specified in 24 hour format. (i.e., for 6:00 PM, input 1800.) You receive a confirmation tone.
To cancel a wake-up call:
1. Lift the handset. 2. Dial the Wake-Up Cancel FFC on the Meridian 1 or the Wake-Up Cancel FAC on the Meridian SL-100.
Hospitality features 3. Press the Goodbye Key. Note: On the Meridian SL-100, after you enter the FAC, you receive a confirmation tone.
To verify the time for the wake-up call:
1. Lift the handset. 2. Dial the Wake-Up Verify FFC.
3. Dial the wake-up time in a 24 hour time format (hhmm). If it is correct, you receive a confirmation tone. Note: This feature is not available on the Meridian SL-100. To change the specified time for a wake-up call on the Meridian SL-100, you must first deactivate the feature and then activate the feature with a new request.
4. Press the Goodbye Key. Note: In 24-hour time format, 7:30 AM is entered as 0730; 9:45 PM is 2145.

Message Registration

Message Registration allows you to read, change, or reset meters that log your hotel telephone calls.

To read meters:

MsgReg
1. Press the Message Registration Key. 2. Dial the room Directory Number (DN).

Use Call indicator light

The incoming call indicator light can be controlled on the M3904. After you select Call indicator light from the Options List menu; On or Off From the Indicator screen, press the On Key to turn on Call indicator light. or Press the Off Key to turn off Call indicator light.

Set On-hook default path

The On-hook default path option (available on the M3903 and M3904) automatically opens the voice path on either the Headset or on Handsfree when you press a Line (DN) Key. After you select On hook default path from the Options List menu; From the On hook path menu, use the Navigation Keys to highlight and select either: Handsfree selected or Headset selected Handsfree selected or Headset selected
Press the Done Key to save selection. Press the Quit Key or Options Key to exit.

Display diagnostics

The Display diagnostics option tests the functionality of your telephones display screen and indicator lights. This option also provides information on the firmware currently in use on your M3900 series telephone. After you select Display diagnostics from the Options List menu; Use the up or down Navigation Keys to scroll through the list and view the changing display screens. Press the Done Key to return to the Options List menu. Press the Quit Key or Options Key to exit.

Control Group Listening

The Group Listening feature enables you to talk on the handset to one party while other people listen to the conversation on your telephones speaker. The network administrator must enable this feature. After you select Group listening from the Options List menu; On or Off From the Group listening screen, press the On Key to turn on Group listening. or Press the Off Key to turn off Group listening.
Note 1: The Group listening selection will not appear in the Options List menu of your telephone unless this feature has been activated by your network administrator. Note 2: This feature does not have a tone to inform the party on the other end of the call that the conversation is being monitored. You must tell the other party that others are listening to the conversation.
M3903 Directory display and navigation

Use the Redial List (M3903)
To access your Redial List:
2. Use the Navigation Keys to highlight Redial List. Redial List Select 3. Press Select.
4. Use the Navigation Keys to scroll through the Redial List and highlight the number you want to call. 2637 Note: If you are calling an external or long distance number, be sure that the appropriate access codes are included. Dial 5. Press the Dial Key. Your call is automatically dialed and you exit the Redial list.
Use the Redial List (M3904)
2. Use the Navigation Keys to highlight Call Log (Redial List). Call Log (Redial List) Select 3. Press Select.
The Personal Directory (available on the M3904) provides a personalized directory of names and telephone numbers. The Personal Directory allows you to add, delete, search, and edit entries and can be password protected. The Personal Directory holds up to 100 entries (an entry is one name and one telephone number). You can add a directory entry by copying the entry from your Callers List or Redial List. You can also add entries with the AddNew Key or by using the Personal Directory PC Utility application. The Personal Directory PC Utility uses an accessory cartridge to connect your PC and your M3904 telephone. You can create a directory on your Personal Computer and transfer it to your M3904 telephone.
Access the Personal Directory
2. Press the Select Key in the Directories menu to select Personal Directory.
Add a Personal Directory entry
After accessing your Personal Directory:

AddNew

1. Press the Add New Key.

2. Dial the new name.

Example: To enter the name Chris:
1. Dial the name using the key pad.
2. Press the dial pad key with the desired letter repeatedly until that letter appears on the display. 3. Press the right arrow key to go to the next letter. Note: The cursor automatically advances to the next position, if a different-from-last key is pressed, or after a short pause.

4. Press the Next Key.

To enter the number:
1. Use the dial pad to enter the telephone number associated with the name entered above. Note: If you are adding an external or long distance number, be sure to include the access codes required by your system to make an external or long distance call. Done 2. When you have finished entering all of the digits, press the Done Key to save the changes. 3. Press the Quit Key or the Directory/Log Key to exit.

Add an incoming call

1. Press the Copy Key. The displays shows the message Copy to. 2. Press the Directory Key.

Dirctry

3. Press Next to copy the incoming call without editing the name. Edit the number, if required (see note for step 4) and go to step 5. or Press Clear to make changes to the name before saving. Add the name using the dial pad, Delete, and Case Keys as needed. 4. Press the Next Key. Make changes to the telephone number if required Note: If you are copying an external or long distance number, be sure to add the access codes required by your system to make an external or long distance call.
5. Press the Done Key to save the entry in your directory. 6. Press the Quit Key or the Directory/Log Key to exit.
Note: You can edit the name or number before or after you save to the directory.

Add an outgoing call

1. Use the dial pad to enter the complete number of the other party. Note: If you are dialing an external or long distance number, be sure to include the access codes required by your system to make an external or long distance call. 2. Lift the handset.
3. After the person you called answers, press the Copy Key. The displays shows Copy to. 4. Press the Directory Key. 5. Add the name, using the dial pad, Delete, and Case Keys as needed.

6. Press the Next Key.

7. Press the Done Key to save the changes. 8. Press the Quit Key or the Directory/Log Key to exit.
Note: You can edit the name or number before or after you save to the Directory.
Delete or edit a Personal Directory entry
To delete a Personal Directory entry:
1. Use the Navigation Keys to highlight the entry you want to edit or delete. Delete 2. Press the Delete Key to delete the currently highlighted entry in your Personal Directory. 3. Press the Yes Key to confirm the deletion.
To edit a Personal Directory entry:
1. Press the Edit Key to change the telephone number or name. 2. Use the Navigation Keys to highlight the character you want to change. 3. Use the dial pad to enter the desired changes. Refer toAdd a Personal Directory entry on page 82 for an example of how to use the dial pad to enter names.
4. Press the Next Key. Edit the number if necessary. 5. Press the Done Key to save the changes. 6. Press the Quit Key or the Directory/Log Key to exit.

4. Press the Features Key.
5. Press the Dial Pad Number Key for the Auto Dial position you just programmed.

Use Auto Dial

2. Press the Features Key.
3. Press the Dial Pad Number Key for the Auto Dial position assigned to the number you want to call. The number dials automatically.
To store a Speed Call Entry:
1. Without lifting the handset, press the Features Key. 2. Press the Dial Pad Number Key assigned to the Speed Call Controller feature. The Feature Activation Indicator flashes. 3. Dial a 1 to 3 digit Speed Call code (ask your network administrator for the number of digits required.) 4. Dial the number you want to program to the Speed Call code entered in the previous step.
5. Press the Features Key.
M3901 Feature Operation 6. Press the Dial Pad Number Key for the Speed Call Controller feature.
3. Press the Dial Pad Number Key for the Speed Call Controller feature or the Speed Call User feature. 4. Dial the Speed Call code of the number you want to call. The Speed Call feature automatically dials the number.

Use Call Transfer

To transfer an active call to a different telephone number follow these steps:
To use the Transfer feature:
1. Press the Hold Key to put the active call on hold. Note: The previous step is not required if the Automatic Hold feature is active.
3. Press the Dial Pad Number Key for the Transfer feature. 4. Dial the number where you want to transfer the call.
5. Press the Features Key when you hear ringing tone.
M3901 Feature Operation 6. Press the Dial Pad Number Key for the Transfer feature. Note: On the Meridian SL-100 use steps one to three then hang up. If you continue, a three way conversation is established.
Use Conference Call feature
To add another party to an established call follow these steps:
To use the Conference Call feature:
3. Press the Dial Pad Number Key for the Conference feature. 4. Dial the number of the party you want to add to the call.
6. Press the Dial Pad Number Key for the Conference feature. Note 1: Repeat these step to add more parties to the conference (up to six). Note 2: Press the Goodbye Key, if you make an error while dialing the number or if you receive a busy signal.

To return to the original caller:

Press the Line (DN) Key.

Activate Ring Again
If you receive a busy tone or no answer when you try to reach someone in your private network, Ring Again gives you audible tone notification when that person is available or has used their telephone. The Ring Again feature allows you to automatically redial the number.
To activate the Ring Again feature:
1. Dial a number and receive a busy tone or no answer. Note: The Meridian SL-100 supports Ring Again on busy tone only.
3. Press the Dial Pad Number Key for the Ring Again feature. 4. Replace the handset.
To use Ring Again to call your party when you receive notification:
3. Press the Dial Pad Number Key for the Ring Again feature. Ring Again dials the number.
To cancel the Ring Again feature:
2. Press the Dial Pad Number Key for the Ring Again feature before you hear the Ring Again notification tone. 96
To dial a number while on-hook:
1. Press the Line (DN) Key.

2. Dial the number.

3. Lift the handset and speak when the party answers.
To use handset and dial number:
1. Lift the handset, the telephone automatically selects the Line (DN). 2. Dial the telephone number.

Receive a call

To receive a call:
Lift the handset when the telephone rings and begin to talk.
Feature Activation Indicator
The Feature Activation Indicator (FAI) serves all five programmable feature keys. The feature indicator LED winks or lights when a feature is active.
Message Waiting and Call Status Indicator
The Message Waiting Indicator (MWI) provides three functions. the MWI flashes for an incoming call, the MWI also flashes to indicate a call on Hold. The MWI produces a steady light to indicate that a message is waiting. The MWI cannot show there is a message waiting if a call is on hold or if there is an incoming call.
Optional items are available for use with your M3900 Series Digital telephone. Please contact your System Administrator for additional details. Note: Wall attachment is available for all four models.
Accessory Connection Module (ACM)
The Accessory Connection Module provides the interface for adding the Analog Terminal Adapter, External Alerter and Recorder Interface, and Meridian Communication Adapter. The ACM is available for the M3902, M3903 and M3904.
Analog Terminal Adapter (ATA)
The ATA allows you to connect an analog device such as a modem or fax machine to your telephone. The ATA is available for the M3902, M3903, and M3904 models.
External Alerter and Recorder Interface
The External Alerter Interface lets you connect a remote ringer to your telephone. The External Alerter and Recorder interface is available for the M3902, M3903, and M3904 models.