Iwatsu ICON Series IX-5910 Owner's Manual page 295

Group Ringing Mode (Group Night) Operation
When the ECS system is in the Group Ringing Mode (default = System
Ringing Mode), pressing the existing Group Night Mode key (Trunk Groups
001-250) from an Iwatsu ICON Series telephone (IX-5810, IX-5910 and IX-
5930) attendant position will take you to the Select Ringing Mode screen
The key operation for the Group Night Mode key with the Group
parameter can only toggle between Day / Night Modes if assigned on
any legacy telephone, the Attendant Console, or ICON Series IX-5800
/ IX-5900
Group Night Mode key assigned to the self labeling key will indicate
current ringing mode as shown below:
To change the ringing mode from an ICON Series Attendant
Position
TGNNN Day-1 indicates Day-1 mode, TGNNN Ring-Day2 indicates Day-2
mode, TGNNN Ring-Day3 indicates Day-3 mode and TGNNN Night
indicates Night mode. *NNN is Trunk Group Number 1-250.
If database programming in Trunks > IPNET/PRI Trunk Group Data >NSF
Ringing-ISDN > Group Name (Class 29.02) has a name assigned, the key
will indicate first 11 characters of the name instead.
Group Night Mode key without the group parameter maintains the legacy
key operation regardless of the type of telephone. The key can only toggle
between Day (Day-1) and Night
Press the Group Mode key. The current ringing mode is displayed in
reverse video
ATTENDANT POSITION USER GUIDE - 275