Question about Comdial DSU II (DSUIISW05)
Press ICM button
Dial # 1
hould shut off light its the background music feture
and you must not have music on your system
Posted on Mar 23, 2008
Un plug your answering machine and plug it back in. If this does not work, try replacing the ac adapter (power cord)
Posted on Feb 19, 2008
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Posted on Jan 02, 2017
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