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This section describes the digital phone's components. Terms that are discussed in this and later sections are introduced in 

italics.

 Also

included are information and procedures for desk set controls and features that apply to all types of calling.

To avoid interruptions in phone service:

Never unplug your desk set.
Never plug another desk set into your phone jack.
Never plug any accessory into your desk set.
Never plug the receiver into any other jack.

Digital desk sets have two types of buttons: 

Call Appearance

 and 

Feature

. Press near the center of a button to activate it. If you wish

to change button labels, follow the instructions on the bottom of the desk set.

Call Appearance (CA) Buttons

Call Appearance (CA) buttons are used to place and receive phone calls, including intercom calls. Each CA button has two 

status

lights

 associated with it. The red light indicates the CA is in use, or will be used when the receiver is lifted. The green light indicates

that a call is in progress or a feature has been activated. CAs are labeled with a 

directory

 or an 

intercom

 number.

Directory Number (DN)

A directory number is a telephone number. Calls placed within MIT from an MIT phone require only the five-digit MIT number
(beginning with the prefix 2-, 3-, 5-, 8-, or -7). Calls to MIT from off-campus require the full ten-digit MIT phone number (beginning with
the prefix 225-, 252-, 253-, 258-, 324-, or 577-).

Primary Directory Number (PDN)

Each digital desk set is assigned a primary directory number (PDN). The PDN is usually the MIT phone number for the person or office
"owning" the desk set.

Secondary Directory Number (SDN)

A secondary directory number (SDN) is any number other than the primary directory number that appears on a telephone. SDNs may
be additional numbers assigned to a phone or numbers shared with other phones. SDNs cannot have voice mail.

Call Appearance Assignments

Digital technology makes it possible to assign the same directory number to more than one Call Appearance button. Your PDN is
always assigned to a minimum of two CAs on your desk set. This means that you can have at least two calls going at once, even
though your telephone is set up for only one directory number.

The last CA of a number is reserved for outgoing or intercom calls. If your PDN has only two CAs, calls can usually come in only on the
first CA. If you have answered or placed a call on the first CA, a second call can't come in. When placing calls you can leave the first
CA open for incoming calls by pressing the second CA of your PDN before making the call.

If you receive many calls you may want to opt for one of two permanent solutions. You can modify the second CA to receive incoming
calls, or you can add a third CA. Call your Customer Service Representative for details and costs.

Feature Buttons

Feature buttons activate special functions of the digital telephone. Features are either 

fixed

 or 

flexible.

Fixed Feature Buttons

Most Fixed Feature buttons control two functions: one for processing calls and an alternate function for controlling the desk set. Fixed
Features for call processing work with any type of call, on PDNs or SDNs. You select alternate functions by pressing 

Shift/Select

 first.

Refer to the appropriate section in this guide for details on fixed features. Some Fixed Feature buttons have a green status light
associated with them.

Flexible Feature Buttons

Flexible Feature buttons activate functions other than fixed features; for example, call pick-up and speed dialing. You request flexible
features when ordering new service or additions to existing service. Flexible Feature buttons are installed only on those phones for
which they are ordered, and work only with a desk set's PDN.

Other Desk Set Features

In addition to Call Appearance and Feature buttons, the digital desk set includes the following components.

Dialing Keypad

Use the alphanumeric keypad for entering telephone numbers and code numbers. The keypad is also used with the voice mail system.
Two keys have special functions in both the 5ESS and voice mail systems:

5ESS Digital (ISDN) Telephone User Guide | IS&T

https://ist.mit.edu/services/telephony/isdnguide

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Summary of Contents for 5ESS

Page 1: ...efficient service each MIT department is assigned a Customer Service Representative CSR Your CSR can be reached at 617 253 4357 Telephone HELP Line If you have trouble with telephone or data communications service call the Telephone HELP desk at 617 253 4357 x3 HELP Voice Mail MIT s voice mail system works in conjunction with the 5ESS telephone system Voice mail is a computer based message system ...

Page 2: ...Your PDN is always assigned to a minimum of two CAs on your desk set This means that you can have at least two calls going at once even though your telephone is set up for only one directory number The last CA of a number is reserved for outgoing or intercom calls If your PDN has only two CAs calls can usually come in only on the first CA If you have answered or placed a call on the first CA a sec...

Page 3: ...ge the loudness of the phone s ring whenever you are not on a call You can change the voice level of the receiver or speaker only when you are on a call 1 Press the arrows until you hear the desired volume Left arrow lowers the volume right arrow raises the volume Result Each press adjusts the volume Digital Phone Options The 5ESS and the digital telephone provide optional features and services th...

Page 4: ... the red light of the call appearance CA you will be using is on If you wish to use a different CA press another CA button 1 Lift the receiver or press Result The green light of the CA you selected comes on and you hear the dial tone 2 Dial the telephone number Answering a Call The phone rings and the green light flashes on the CA carrying the call 1 Lift the receiver or press 2 Press the CA butto...

Page 5: ...ng a call and press again Result The call is transferred Placing a Conference Call You can set up a three way conference call from your digital phone with two other parties on or off campus 1 While on the active call press Result The call is held for conference The red light for that CA goes off the green light flutters The next available CA for that DN is selected and its red and green lights com...

Page 6: ...utomatic intercom between two pre determined parties One digit Dial intercom group of up to ten parties Two digit Dial intercom group of up to twenty parties If your desk set is equipped for intercom calling one of its CAs is labeled as an intercom button Intercom calling is an option that you request when ordering new service or changing existing service Destinations and calling codes are set whe...

Page 7: ...igit Intercom Two digit Dial Intercom service includes up to ninety nine parties The intercom destinations are assigned code numbers 01 through 99 1 Lift the receiver or press 2 Press Result The Intercom green light comes on and you hear a stutter dial tone 3 Press and enter the two digit intercom code of the desired party Result Your intercom call is placed Receiving Intercom Calls A single stead...

Page 8: ...ons and gives the codes to activate and cancel each one You can have any combination of call forwarding conditions active at one time however forwarding of all calls supersedes any other active forwarding Forwarding Condition Activate Cancel Unanswered calls your phone rings before it is forwarded Incoming calls encountering a busy signal All calls your phone doesn t ring If you forward unanswered...

Page 9: ...tivate the forwarding of unanswered calls code 78 the system forwards a call after five rings of your telephone or twenty seconds You can change the number of times your phone rings actually the elapsed number of seconds before a call is forwarded In the procedure below enter the number of seconds from the following table to get the desired number of rings before forwarding 1 ring 4 seconds Second...

Page 10: ...lus the off campus phone number to which calls will be forwarded including area code Note You do not press 9 as you would for normal off campus calls Result You hear a confirmation tone of two quick beeps followed by the dial tone The 5ESS places a confirmation call to the forward to number this call does not have to be answered If you don t have off campus calling privileges you hear a fast busy ...

Page 11: ...and want to use two digit speed dialing send email to telephone help mit edu or call 617 253 4357 1 Lift the receiver 2 Enter the Speed Dial Program code 3 Listen for dial tone again If you do not get a dial tone then send e mail to telephone help mit edu or call 3 6370 requesting no charge activation of speed dialing 4 Assign a two digit code from 00 zero zero to 19 If the 2 digit code is already...

Page 12: ...if several phones are near each other 1 Press 2 Press Result You hear the current ring pattern 3 Press Result You hear the next ring pattern Repeat step 3 to hear each successive ring pattern 4 When you hear the ring pattern you want press Result The desk set beeps twice Your phone will now ring with the selected pattern Setting the Clock The date and time are shown on the phone s display panel wh...

Page 13: ...nd the various tones on your desk set If any steps in the test fail or your service is affected call the Telephone Support Services HELP line at x3 4357 x3 HELP 1 Press 2 Press Result The green Message light comes on and a tone begins repeating 3 Lift the receiver and press each button on the telephone Result Each light next to a button should come on You should hear a tone when you press buttons ...

Page 14: ...dentified by a letter On the Model 7506 desk set the nine CAs are designated by the letters a through j On the Model 7507 desk set the thirty CAs are designated by the lowercase letters a through z and the uppercase letters A through D Directory Number When you place a call the display shows the digits as you enter them When you receive a call information on the origin of the call is displayed For...

Page 15: ...ing If you are unsure which class of service is on your phone check with your department s Administrative Officer or call your Telephone Support Services Customer Representative If you try to place a call outside the restrictions of your service class you will hear a recording or a fast busy signal Class of Service Description A Completely unrestricted Can call world wide without using account num...

Page 16: ... computer dial up applications Restricted to placing and receiving calls only within MIT No access to toll operators or tie lines F Generally reserved for lobby phones Restricted to placing and receiving calls only within MIT Access to toll operators and tie lines is allowed Information Services and Technology 617 253 1101 Ask the Help Desk or contact the IS T Webmasters 5ESS Digital ISDN Telephon...

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