![](/images/new-backgrounds/1309163/309163345x1.webp)
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| 1.19 Proprietary Telephone (PT) Features | |
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| Button | Usage | |
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| Flexible CO (Trunk) | Used to make or receive a trunk call or can be reassigned to | |
| a different trunk or to another feature button. | ||
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| Flexible DSS (Direct Station | Used to access an extension with | |
| is programmed to correspond to an extension. DSS buttons | ||
| Selection) | ||
| can also be reassigned to other features. | ||
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| PF (Programmable Feature) | Used to access a preprogrammed feature with | |
| (no default) | ||
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Conditions
•Certain buttons are equipped with a light to show line or feature status.