What should incoming calls without voice contact be checked for?

Incoming calls without voice contact should be checked for TDD/TTY/text phone systems because these systems are designed to facilitate communication for individuals who are deaf, hard of hearing, or have speech disabilities. When a call comes in without any audible voice contact, it may be utilizing one of these devices.

TDD (Telecommunications Device for the Deaf) and TTY (Teletypewriter) allow users to send and receive text communications over phone lines. In emergency situations, being able to recognize that a call is coming from a TDD/TTY device is crucial for providing timely assistance and ensuring that the necessary support is offered. It is important for emergency responders to be equipped to handle calls from these systems effectively.

While the other options might have potential relevance to different contexts of communication technology, they do not directly align with the protocols for emergency call handling designed for individuals using TDD/TTY/text devices.