12-Key Feature Phone
The 12-Key Feature Phone includes the basic, most commonly used phone features. This simplified model is available only as a digital model (i.e., not compatible with IP E-Class systems) and doesn’t support IP, ESI’s VIP family of software applications1, the Expansion Consoles, speakerphone operation2, or Esi-Dex.

Note:
The following features aren’t available on a 12-Key Feature Phone:
- Certain special keys and features.
- Esi-Dex.
- ACD operation.
Additionally: to use voice mail, conference calling and mute/DND on a 12-Key Feature Phone, you must program these features into programmable feature keys (see also “Optional features”).
Hint:
You can perform direct programming by holding down a programmable feature key for at least two seconds (similar to how you might program a car radio button). This isn’t applicable to the fixed-feature keys which, as their name implies, are already programmed.
