Vodavi Starplus Triad-S Product Description Manual page 73

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Enhanced or Executive Digital Telephones -- The 24/12-button models
have 11 fixed feature buttons and 24/12 flexible buttons. Each flex button
can be assigned as a CO/PBX line, DSS button, Speed Dial or Feature button.
Refer to Table 2-2: Flex Button Programming
Figure 2-2: Digital Executive (24-Button) Telephone
Figure 2-3: Digital Executive (12-Button) Telephone
Flexible Button Assignment
Codes.