JK Audio Four IFB - Manual (Page 19)

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FCC Registration
b) The telephone equipment's FCC registration number.
This can be found on the bottom of your telephone
equipment, and,
c) the ringer equivalence number (REN) for this equipment.
The REN is used to determine the quantity of devices which
will be connected to the telephone line. Excessive RENs on
the telephone line may result in the devices not ringing in
response to an incoming call. In most, but not all areas, the
sum of the RENs should not exceed 5.0. To be certain of the
number of devices that may be connected to the line, as
determined by the total RENs, contact the local telephone
company.
3. Repair Instructions
If it is determined that your telephone equipment is
malfunctioning, the FCC requires that it not be used and
that it be unplugged from the modular outlet until the
problem has been corrected. Repairs to this telephone
equipment can only be made by the manufacturer or its
authorized agents or by others who may be authorized by
the FCC. For repair procedures, follow the instructions
outlined under the warranty section of the manual.
4. Rights of the telephone company
If telephone equipment is causing harm to the network, the
telephone company may temporarily discontinue your
telephone service. If possible, they'll notify you before they
interrupt service. If advanced notice isn't practical, you'll be
notified as soon as possible. You'll be given the opportunity
to correct the problem, and you'll be informed of your right
to file a complaint with the FCC.
Your telephone company may make changes in its
facilities, equipment, operations or procedures that could
affect the proper functioning of your JK Audio product. If
such changes are planned, you'll be notified by your
telephone company.