Final answer:
The Department of Justice recommends TTY refresher training at least every six months to ensure accessibility of emergency communication services to individuals with hearing or speech disabilities.
Step-by-step explanation:
The Department of Justice suggests that a TTY refresher training should be provided at least every six months, or as often as the PSAP offers training for voice calls. TTY, also known as text telephone, teletypewriter, or telecommunications device for the deaf (TDD), is a device that allows individuals who are deaf, hard of hearing, or have a speech impairment to communicate over the telephone. PSAP stands for Public Safety Answering Point, which is the first point of contact for individuals calling 9-1-1 or another emergency number. This recommendation is part of an initiative to ensure that emergency communication services are accessible to everyone, including those with hearing or speech disabilities.