What are the standards and ratings for Hearing Aid Compatible phones?
The standard for compatibility of digital wireless phones with hearing aids is set forth in American National Standard Institute (ANSI) standard C63.19. ANSI C63.19 contains two sets of standards: an “M” rating from one to four for reduced radio frequency (RF) interference to enable acoustic coupling with hearing aids that do not operate in telecoil mode, and a “T” rating from one to four to enable inductive coupling with hearing aids operating in telecoil mode. A digital wireless phone is considered hearing aid-compatible for acoustic coupling if it meets an “M3” rating under the ANSI standard. A digital wireless handset is considered hearing aid-compatible for inductive coupling if it meets a “T3” rating under the ANSI standard.
