Question 23/XII - Coupling of hearing aids to telephone receivers
(continuation of Question 23/XII studied in 1984-88; new wording)

Considering

(a) that due to deregulation on the telephone set market many
administrations and license giving bodies have a strong need for methods
to evaluate how signals are transferred from a telephone set to a
hearing aid;

(b) that in real life very often magnetic or acoustic coupling
techniques are used;

(c) that there is a growing interest in magnetic loop systems;

(d) that in-the-ear hearing aids are becoming increasingly available;

recommends that the following should be studied:

-What parameters should be defined to describe the coupling?

-How are these parameters measured?

-What values or intervals of the parameters can be recommended?

-How can Recommendation P.37 be extended to include the essential
information on description of couplings, measuring methods and
recommended values for important parameters to ensure that hearing
impaired subscribers can communicate using the telephone network?