EXPANDING THE PHONE SYSTEM

When you combine two or more 945/974/984/944/955/964 phones you create an interacting system where phones share lines. If you have only 945/974/984 phones on your phone system, you can have up to 16 phones and up to 19 telephone lines. If you have one or more 944/955/964 phones in your phone system, you can have up to 12 phones and up to 15 telephone lines. The system can be expanded with or without Centrex service.

NOTE: All 945 features work as described earlier in this manual.

Line Groups

When phones share lines, the LINE lights let users at different extensions know when a specific line is in use. For accurate LINE 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

L7

 

EXT 11

 

 

 

Extensions

EXT 12

 

 

 

EXT 13

 

 

EXT 14

 

 

 

EXT 15

 

 

EXT 16

 

 

 

EXT 17

 

 

Intercom

 

 

EXT 18

 

 

 

EXT 19

 

 

EXT 20

 

 

 

EXT 21

 

 

 

 

 

 

EXT 22

 

 

 

 

 

 

 

 

 

 

 

 

 

EXT 23

 

 

 

 

 

 

 

 

 

 

 

 

EXT 24

 

 

 

 

 

 

 

 

 

 

 

 

 

EXT 25

 

 

 

 

 

 

 

 

 

 

 

 

EXT 26

 

 

 

EXPANDINGTHE PHONE SYSTEM

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AT&T 945 user manual Expanding the Phone System, Line Groups