24-Key Feature Phone
The 24-Key Feature Phone has features similar to those of the 48-Key Feature Phone. However, the 24-Key Feature Phone is available only as a digital model (i.e., not compatible with IP E-Class systems) and doesn’t support IP or ESI’s VIP family of software applications1, or the Expansion Consoles. As is true for the 48-Key Feature Phone, the 24-Key Feature Phone’s built-in voice mail features and voice prompts make it easy to program and use.

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.
