Operation Manual

12
Operation
Telephone Use
Your hearing system has an Automatic Telephone
Response that enables you to comfortably use
the telephone without removing your hearing
instrument. Place the telephone handset in a
normal position. When correctly positioned, you
will hear an indicator for the automatic activation of
the telephone program.
Some hearing aid users have reported a buzzing
sound in their hearing aids when they are using cell
phones, indicating that the cell phone and hearing
aid may not be compatible. According to the ANSI
C63.19 standard (ANSI C63.19-2006 American
National Standard Methods of Measurement of
Compatibility Between Wireless Communications
Devices and Hearing Aids), the compatibility of
a particular hearing aid and cell phone can be
predicted by adding the rating for the hearing aid
immunity to the rating for the cell phone emissions.
For example, the sum of a hearing aid rating of 2
(M2/T2) and a telephone rating of 3 (M3/T3) would
result in a combined rating of 5. Any combined
rating that equals at least 5 would provide “normal
use”; a combined rating of 6 or greater would
indicate “excellent performance.”