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Telephone features / 151
P0881591 Issue 01
Modular ICS 4.0 System Coordinator Guide
Do Not Disturb prevents voice calls from alerting at your 
telephone. Voice calls are presented as normal intercom calls.
Using Background Music
ƒ°fl
Listen to music through your telephone speaker by pressing 
ƒ°fl.
Your installer or service representative makes this feature 
available to all telephones in programming. You need to 
supply a music source, such as a radio, and have it attached to 
your ICS.
Turning Background Music off
The music stops automatically if you make or answer a call or 
if you press 
ƒ£°fl.
Tip - 
Norstar sets that are members of a Hunt Group can 
temporarily leave a Hunt Group by activating this feature. 
Hunt Group calls arriving while a set is in Do Not Disturb 
mode are routed to the next member in the Hunt Group. 
For more information on Hunt Groups see “Programming 
Hunt Groups”  on page 135.
In accordance with U.S. copyright law, a license 
may be required from the American Society of 
Composers, Authors and Publishers or a similar 
organization if radio or TV broadcasts are 
transmitted through the Background Music feature 
of this telecommunication system.
Northern Telecom Inc. hereby disclaims any liability 
arising out of the failure to obtain such a license.
p0881591.book  Page 151  Wednesday, August 19, 1998  6:43 PM