Telecommunications products or systems which provide a function
allowing voice communication and which do not themselves provide a TTY
functionality shall provide a standard non-acoustic connection point for
TTYs. Microphones shall be capable of being turned on and off to allow
the user to intermix speech with TTY use.
Telecommunications products which include voice communication
functionality shall support all commonly used cross-manufacturer non-proprietary
standard TTY signal protocols.
Voice mail, auto-attendant, and interactive voice response
telecommunications systems shall be usable by TTY users with their TTYs.
Voice mail, messaging, auto-attendant, and interactive voice
response telecommunications systems that require a response from a user
within a time interval, shall give an alert when the time interval is about
to run out, and shall provide sufficient time for the user to indicate
more time is required.
Where provided, caller identification and similar telecommunications
functions shall also be available for users of TTYs, and for users who
cannot see displays.
For transmitted voice signals, telecommunications products
shall provide a gain adjustable up to a minimum of 20 dB. For incremental
volume control, at least one intermediate step of 12 dB of gain shall be
If the telecommunications product allows a user to adjust
the receive volume, a function shall be provided to automatically reset
the volume to the default level after every use.
Where a telecommunications product delivers output by an
audio transducer which is normally held up to the ear, a means for effective
magnetic wireless coupling to hearing technologies shall be provided.
Interference to hearing technologies (including hearing aids,
cochlear implants, and assistive listening devices) shall be reduced to
the lowest possible level that allows a user of hearing technologies to
utilize the telecommunications product.
Products that transmit or conduct information or communication,
shall pass through cross- manufacturer, non-proprietary, industry-standard
codes, translation protocols, formats or other information necessary to
provide the information or communication in a usable format. Technologies
which use encoding, signal compression, format transformation, or similar
techniques shall not remove information needed for access or shall restore
it upon delivery.
Products which have mechanically operated controls or keys,
shall comply with the following:
(1) Controls and keys shall be tactilely discernible without
activating the controls or keys.
(2) Controls and keys shall be operable with one hand
and shall not require tight grasping, pinching, or twisting of the wrist.
The force required to activate controls and keys shall be 5 lbs. (22.2
(3) If key repeat is supported, the delay before repeat
shall be adjustable to at least 2 seconds. Key repeat rate shall be adjustable
to 2 seconds per character.
(4) The status of all locking or toggle controls or keys
shall be visually discernible, and discernible either through touch or