NEC SL1100 Features And Specifications Manual page 744

SL1100
5. Press Speaker key to hang up (if the key is lit).
While the feature is active, if either the master or slave telephone is on a call, no calls can be
placed or answered at the other extension until the busy telephone has hung up. Multiline
Terminals indicate TANDEM IN USE in the display and Single Line Terminal users hear a busy
signal when the handset is lifted.
To cancel Tandem Ringing:
1. Dial PRG 11-11-41.
- OR -
Press the Tandem Ringing key (PRG 15-07 or SC 751 : 80).
2. Dial 0 to cancel the feature.
T
1-732
ISSUE 2.0
Tandem Ringing