Expanding The Phone System; Line Groups - AT&T Four-Line Intercom Speakerphone 974 User Manual

974_CIB_1ATT_033104

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.
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NOTE: All 974 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 16 extensions, each sharing the first three lines,
but being assigned to different Line Groups based on other shared or
private lines.
EXT 11
EXT 12
EXT 13
EXT 14
EXT 15
EXT 16
EXT 17
EXT 18
EXT 19
EXT 20
EXT 21
EXT 22
EXT 23
EXT 24
EXT 25
EXT 26
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Lines in System
L1 L2 L3 L4 L5 L6 L7
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