Incoming calls without voice should be checked for which signal?

Incoming calls without voice should be checked for which signal?

• A. Fax or modem initiation signals
• B. An open carrier
• C. TDD/TTY/text phone signal
• D. Instant messaging signal

Answer: (C)

When a call arrives with no voice, you’re most likely dealing with a text-based communication device rather than a spoken conversation. The signal to check for is a TDD/TTY/text phone signal, which indicates a teletypewriter or text-based device on the line. Recognizing this lets you switch to text communication and engage with the caller effectively, ensuring they can convey information even without a spoken voice. The other signals describe data or line conditions that aren’t the typical indication of a non-voice call for dispatch purposes: fax or modem initiation signals are data-call tones, an open carrier just means the line is idle or has no signal, and an instant messaging signal isn’t part of standard telephone signaling.

When a call arrives with no voice, you’re most likely dealing with a text-based communication device rather than a spoken conversation. The signal to check for is a TDD/TTY/text phone signal, which indicates a teletypewriter or text-based device on the line. Recognizing this lets you switch to text communication and engage with the caller effectively, ensuring they can convey information even without a spoken voice.

The other signals describe data or line conditions that aren’t the typical indication of a non-voice call for dispatch purposes: fax or modem initiation signals are data-call tones, an open carrier just means the line is idle or has no signal, and an instant messaging signal isn’t part of standard telephone signaling.