NEC Univerge SV8100 Features And Specifications Manual page 324

Issue 13.0
Default Setting
The attendant (extension 101) has Class of Service 15 in all Night Service modes. All other

extensions have Class of Service 1 in all Night Service modes.
If changing Class of Service via Service Code:
An extension can use Service Code 677 to change another extension Class of Service

(Program 20-13-28 = 1).
An extension can automatically block another extension attempt to change their Class of

Service via Service Code 677 (Program 20-13-28 = 0).
The default Service Code for this option is 677 (Program 11-11-24 = 677).

System Availability
Terminals
All Terminals
Required Component(s)
None
Related Features
Night Service
2 - 290
UNIVERGE SV8100
Class of Service