The NBX Business Telephone includes 18 Access buttons. The characteristics of these buttons are:

• You must use two as System Access buttons.

• You can assign CO telephone lines or line pool access to buttons that have lights.

• You can assign one-touch actions such as Speed Dial, or system features such as Call Park to any of the 18 buttons.

• If you do not assign a function to a button, the user can assign personal settings to the button.

A Busy Lamp/Speed Dial button is an Access button that is mapped so that it can function as a speed dial to another extension and also indicate when that extension is in use. When you press the Access button mapped to the Busy Lamp/Speed Dial button, you dial the mapped extension.

When the other extension is in use, the lamp lights on your telephone.

You can define a ringing progression for a line mapped to multiple telephones. For example, you can configure a call to ring immediately at telephone 1, begin ringing at telephone 2 after 4 rings, then begin ringing at telephone 3 after 8 rings. Any of the telephones can pick up the call at any time, even if it has not started ringing at a particular telephone. (It is flashing.) Delayed ringing is useful for backup coverage on shared lines, such as for secretaries who must cover each other’s lines.