EXPANDING THE PHONE 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 phone 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
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| L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 | L9 | L10 | L11 | L12 | L13 | L14 | L15 |
| ICM 11 | ✔ | ✔ | ✔ | ✔ |
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| ICM 12 | ✔ | ✔ | ✔ |
| ✔ |
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Stations | ICM 13 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 14 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 15 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 16 | ✔ | ✔ | ✔ |
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| ✔ |
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Intercom |
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ICM 17 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 18 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 19 | ✔ | ✔ | ✔ |
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| ✔ |
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ICM 20 | ✔ | ✔ | ✔ |
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| ✔ |
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| ICM 21 | ✔ | ✔ | ✔ |
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| ✔ |
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| ICM 22 | ✔ | ✔ | ✔ |
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| ✔ |
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