AT&T user manual Expanding the 955 System, Line Groups, Private Lines

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EXPANDING THE 955 SYSTEM

When you combine two or more 955 phones you create an interacting system where phones share lines. You can have up to twelve phones and up to 15 telephone lines. The 955 can be expanded with or without Centrex service.

NOTE: All 955 features work as described earlier in this manual.

Line Groups

When phones share lines, Line-in-use lights let users at different extensions know when a specific line is in use. For accurate Line-in-use lights, the same lines must be connected to each extension in the Line Group, and they must have the same incoming telephone number at each extension.

The chart below shows 12 extensions, each sharing the first three lines, but being assigned to different Line Groups based on other shared or private lines.

Lines in System

		L1	L2	L3	L4	L5	L6
	ICM 11	✔	✔	✔	✔
	ICM 12	✔	✔	✔		✔
Stations	ICM 13	✔	✔	✔	✔
	ICM 14	✔	✔	✔		✔
	ICM 15	✔	✔	✔	✔
	ICM 16	✔	✔	✔		✔
Intercom	ICM 16	✔	✔	✔		✔
	ICM 17	✔	✔	✔	✔
	ICM 18	✔	✔	✔		✔
	ICM 19	✔	✔	✔	✔
	ICM 20	✔	✔	✔		✔
	ICM 20	✔	✔	✔		✔
	ICM 21	✔	✔	✔	✔
	ICM 22	✔	✔	✔			✔

EXPANDING THE 955 SYSTEM

Private Lines

You can use the fourth line on each station as a private line. A private line is a telephone number assigned to just one extension.

NOTE: You must program the lines you are using at each extension so that the system knows which lines are shared and which are private (you cannot physically wire lines with different telephone numbers into each unit for Line 4).

The chart below shows 12 extensions, each sharing the first three lines and having its own private line.

Lines in System

L1

L2

L3

L4

L5

L6

L7

L8

L9

L10

L11

L12

L13

L14

L15

ICM 11

✔

✔

✔

✔

ICM 12

✔

✔

✔

✔

Stations

ICM 13

✔

✔

✔

✔

ICM 14

✔

✔

✔

✔

ICM 15

✔

✔

✔

✔

ICM 16

✔

✔

✔

✔

Intercom

ICM 17

✔

✔

✔

✔

ICM 18

✔

✔

✔

✔

ICM 19

✔

✔

✔

✔

ICM 20

✔

✔

✔

✔

ICM 21

✔

✔

✔

✔

ICM 22

✔

✔

✔

✔

56

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Contents Four-Line Intercom Speakerphone Part 1 Important Product InformationContents Contents Before YOU BeginGlossary Features List Audible SignalsInstall one 9V battery InstallationTable/Desk Installation Connect the telephone line cords to the telephoneWall Installation Connect the power adapter to the telephone Plug one end of the coiled handset cord into the jack onMount the phone on the wall SET UP System Features Convenience PortsSet the Time/Date Turn Covm Indicator On or Off for Each LineChange Display Language Assign an Extension Number to Your PhoneTurn Line Usage On or Off for Each Line Set Delay RingSet the Dial Mode Assign the Prime Line Line PreferenceTurn Hold Reminder On or Off Program the Centrex Console Delayed Ring TimeErase All Settings and Return the Phone to Default Settings Program Home and Local Area CodesHandset Telephone OperationMaking or Answering a Call SpeakerphoneCall Privacy TimerVolume Do Not DisturbAuto Redial Switch Between LinesRedial HoldConference Calls Low Battery IndicatorTemporary Tone Dialing Transfer a CallSpeed Dial Operation Storing a Name and a Number in a Speed Dial LocationMaking a Speed Dial Call Reviewing Information Stored in a Speed Dial LocationEditing Information Stored in a Speed Dial Location Removing Information from a Speed Dial LocationStoring Names and Numbers in the Directory Storing a Temporary Tone Signal in a Directory NumberDirectory Operation Storing a Pause in a Directory NumberReviewing Information Stored in the Directory Changing Directory EntriesDialing a Number from the Directory Removing a Name and Number from the Directory Removing All Entries from the DirectoryIntercom Operation Paging All Phones Switching Between an Intercom Call and a Single-phoneEnding an Intercom or Page Call Answering a System-wideCaller ID Operation Caller ID OperationCall Waiting Calls Received on Two or More Lines SimultaneouslyMessage Waiting and NEW Call Light Call List Display MessagesRemoving Calls from Call List Saving a Number from Call List to the Directory Reset Covm IndicatorDialing a Number from Call List Time/DateUsing a Fax Switch Adding a FAX MachineCase of Difficulty Covm Line Indicator Remains On Tone Signals Do Not Activate a Remote DeviceOperation During a Power Failure No Caller ID Information While on a CallExpanding the 955 System Line GroupsPrivate Lines Centrex Operation Index All Removed! 38 AM/PM Area CODEs 7TONE/PULSE 6 Page Four-Line Intercom Speakerphone Speed Dial Operation pages