NEC SL1000 Features And Specifications Manual page 305

ISSUE 1.0
You can also check any other extension numbers information by pressing Help + the extension number.
3. Press Exit to return the normal time/date display.
To change how Intercom calls ring the extension:
1. Press Speaker or lift the handset.
2. Dial 823 to have calls ring your extension.
- OR -
3. Dial 821 to have calls voice announce to your extension.
Features and Specifications Manual
SL1000
I
1-297