Last Number Redial (LNR), which is defined on a customer and a telephone basis, allows the last number dialed by a user to be automatically stored.

The stored number can be redialed by pressing the primary extension line appearance twice (“double DN/Line Key press”), or by dialing the feature access code on analog telephones.

The number is stored whether the call rings, is busy or answered, or a valid access code is dialed with the number.

Only one number, of up to 24 digits, can be stored at any one time. The new number overwrites the previously stored number.

Note that the Communication Manager and the CS 1000 support the “Last Number Redial” button, but it was used much less frequently than the double key press.