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The M mark is intended to be synonymous with the U
mark. The T mark is intended to be synonymous with the
UT mark.
The M and T marks are recommended by the Alliance
for Telecommunications Industries Solutions (ATIS). The
U and UT marks are referenced in Section 20.19 of the
FCC Rules.
The HAC rating and measurement procedure are
described in the American National Standards Institute
(ANSI) C63.19 standard.
To enter that the Hearing Aid Compatibility rating for
your phone is maintained, secondary transmitters such
as Bluetooth and WLAN components must be disabled
during a call.
For information about hearing aids and digital wireless phones
Wireless Phones and Hearing Aid Accessibility
http://www.
accesswireless.org/
FCC Hearing Aid Compatibility and Volume Control
http://www.
fcc.gov/cgb/consumerfacts/hac_wireless.html