Final answer:
Direct TTY call reception at PSAPs signifies the ability of emergency services to receive calls from TTY devices without intermediary services, providing immediate communication for hearing or speech-impaired individuals.
Step-by-step explanation:
When PSAPs (Public Safety Answering Points) must directly receive TTY (Teletypewriter) calls without relying on an outside relay service or third-party services, it means they should be capable of Direct TTY call reception. This requirement ensures that individuals who are deaf, hard of hearing, or have a speech impairment can communicate directly with emergency services operators through TTY devices. The ability to receive these calls directly is crucial in emergency situations where every second counts, and the use of third-party services could introduce delays.