NEC SL1000 Features And Specifications Manual page 527

ISSUE 1.0
7 = Midnight 2
8 = Rest 2
8. Press Hold for a second time for Delayed Ring, or Skip to step 10.
9. Dial the mode number in which the key delay rings.
1 = Day 1
2 = Night 1
3 = Midnight 1
4 = Rest 1
5 = Day 2
6 = Night 2
7 = Midnight 2
8 = Rest 2
10. Press Speaker.
Features and Specifications Manual
SL1000
V
1-519