![](/images/new-backgrounds/1256961/25696119x1.webp)
Administrator programming: An introductionIVX
System fixed numbering plan |
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| Numbers |
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| Function |
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| Generation II |
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| Generation I |
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| 0 |
| 0 |
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| Operator | |||
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| CO lines | |||||
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| Digital extensions | |||||
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| Analog extensions | |||||
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| 199 |
| 199 |
| Overhead paging port | ||||
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| Department numbers | |||||||
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| Guest/info mailboxes | ||||
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| 500 |
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| Broadcast mailbox | |||
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| Cascade mailboxes | |||||||
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| Feature codes | ||||||
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| MOH recordings | |||||||
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| System | |||||||
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Note: If unsure whether your IVX
1 If using system software version 4.7.0 or later; otherwise, same as Generation I.
A.6