Plantronics M22 - Manual (Page 15)

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the customer as soon as possible. Also, you will be advised of
your right to file a complaint with the FCC if you believe it is
necessary.
The telephone company may make changes in its facilities,
equipment, operations, or procedures that could affect the
proper functioning of your equipment. If they do, you will
be notified in advance in order for you to make necessary
modifications to maintain uninterrupted service.
If trouble is experienced with this unit, for repair or warranty
information, please contact customer service at (800) 544-4660.
If the equipment is causing harm to the network, the telephone
company may request that you disconnect the equipment until
the problem is resolved.
DO NOT DISASSEMBLE THIS EQUIPMENT: it does not contain
any user serviceable components.
We recommend the installation of an AC surge arrester in the
AC outlet to which this equipment is connected. Telephone
companies report that electrical surges, typically lighting
transients, are very destructive to customer terminal equipment
connected to AC power sources.