the following info comes from Western Institute for the Deaf and Hard of Hearing:
FCC Mandates Cell Phone Compatibility with Hearing Aids- ANSI C63.19
FCC Mandates Cell Phone Compatibility with Hearing Aids- ANSI C63.19
March 22, 2007 // Published as a news service by IHS
Mobile phone manufacturers have one year to comply with a U.S. Federal Communications Commission (FCC) mandate requiring mobile handsets built or used in the U.S. to comply with the American national standard for cell phone-hearing aid compatibility.
Issued in 2003, the mandate is intended to ensure that new mobile phones available on the market are accessible to individuals using hearing aids.
IEEE C63.19 2007-JAN-01 • Active/Current •
Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing AidsThis standard applies to both wireless communications devices (WDs) and hearing aids. It sets forth uniform methods of measurement and parametric requirements for the electromagnetic and operational compatibility and accessibility of hearing aids used with WDs, including cordless, cellular, personal communications service (PCS) phones, and voice over internet protocol (VoIP) devices, operating in the range of 800 MHz to 3 GHz. However, this version is focused on existing services, which are in common use. Accordingly, in this version tests are provided for services in the 800 MHz to 950 MHz and 1.6 GHz to 2.5 GHz frequency bands. Future versions may add test for other frequency bands, as they come into more common use.This standard is intended to apply to all types of hearing aids with acoustic output, including, as examples, behind-the-ear (BTE), in-the-ear (ITE), in-the-canal (ITC), and completely-in-the-canal (CIC) types. Test methods are provided for hearing aids operating in acoustic (microphone input) mode or in T-Coil input mode.The field levels called for in various places shall be maintained within the limits for radio frequency (RF) safety, set forth in ANSI C95.1-1999.1