Plantronics M22 - Manual (Page 14)

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FCC REQUIREMENTS
This equipment complies with Part 68 of the FCC rules and
the requirements adopted by ACTA. On the exterior of this
equipment is a label that contains a product identifier in the
format US:AAAEQ##TXXXX. If requested, this information must
be provided to your telephone company.
A plug and jack used to connect this equipment to the premises
wiring and telephone network must comply with the applicable
FCC Part 68 rules and requirements adopted by ACTA. A
compliant telephone cord and modular plug is provided with
this product. It is designed to be connected to a compatible jack
that is also compliant. See installation instructions for details.
The REN is useful to determine the quantity of devices you
may connect to your telephone line. Excessive RENs on a
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 five (5.0). To be certain of the number
of devices you may connect to your line, as determined by
the REN, contact your local telephone company. For product
approved after July 23, 2001, the REN for this product is part of
the product identifier that has the format US:AAAEQ##TXXXX.
The digits represented by ### are the REN without the decimal
point. (For example, 03 represents a REN of 0.3.) For earlier
producers, the REN is separately shown on the label.
If this telephone equipment causes harm to the telephone
network, the telephone company will notify you in advance that
temporary discontinuance of service may be required. But if
advance notice isn’t practical, the telephone company will notify