- Multi-line
- Full speakerphone
- System-wide feature buttons
- User-defined buttons
- Hot-dial keypad
- Message waiting light
- Headset compatible
- Adjustable ringing volume, cadences & tones
- Choice of pearl white or charcoal grey matte finishes
- Choice of custom faceplates
- Desk or wall mountable
- Hearing aid compatible/ volume control (HAC/VC)
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- ADA (Americans with Disabilities Act) compliant
- Range Limit = 3,500 feet from cabinet
- Handset/headset disconnect feature (HDF) (FlexSet 120S and 280S only)

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- LCD 2-line display with 24 or 40 characters/line
- LCD 3-line display with 24 or 40 characters/line
- Multi-language capability
- 8 to 148 user-defined buttons
- Soft-keys with navigation buttons
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- 40-button programmable expansion module (40B)
- TAPI application module (APA)
- Range extender to 6,250 feet from cabinet

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