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EXPANDING THE PHONE SYSTEM
When you combine two or more 944/955/964 phones you create an
interacting system where phones share lines. 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 944 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
Intercom Stations
L1 L2 L3 L4 L5 L6
ICM 11 ✔✔✔✔
ICM 12 ✔✔✔ ✔
ICM 13 ✔✔✔✔
ICM 14 ✔✔✔ ✔
ICM 15 ✔✔✔✔
ICM 16 ✔✔✔ ✔
ICM 17 ✔✔✔✔
ICM 18 ✔✔✔ ✔
ICM 19 ✔✔✔✔
ICM 20 ✔✔✔ ✔
ICM 21 ✔✔✔✔
ICM 22 ✔✔✔ ✔