Speed dial numbers set via your desk set may be replaced with future updates or changes to the VoIP system. Press and hold unused line key button. You will be presented with a screen where you can key ...

You can change the labels that the phone displays for your extensions, features, and abbreviated dial or speed dial buttons. For example, you can change the label for your extension to My Line. If you ...

With that in mind, the phone doesn't include a full keypad. Instead, there are simply several speed-dial buttons on the front, which only dial pre-set numbers. It's about as no-frills as it gets.