Lucent Technologies MERLIN LEGEND Release 6.1 Feature Reference page 283

MERLIN LEGEND Communications System Release 6.1
Feature Reference 555-661-110
Features
Direct Station Selector
Service Observing
Signal/Notify
System
Renumbering
In Release 6.1 and later systems, a Service Observer can use a DSS
button to enter a local extension number to establish an observing
session.
If a user presses a Signal button programmed with an operator's
extension while making a call to the operator, the LED next to the DSS
button associated with the user changes from flashing to on, while the
Signal button is held down. This works only for local extensions.
The beginning extension number for each page is assigned through
system programming. The factory settings are as follows: Page 1 button
begins with Extension 0, Page 2 button begins with Extension 50, and
Page 3 button begins with Extension 100.
Issue 1
August 1998
Page 234