Which statement is true regarding conference-in capability in emergency communications?

The statement regarding conference-in capability in emergency communications being true highlights its role in facilitating direct communication with telematics users. Telematics systems often provide vital information about vehicles and may transmit data in real-time during emergencies. By utilizing conference-in capability, emergency communications personnel can engage with telematics users, such as those in connected vehicles, to gain crucial insights or updates on the situation at hand. This feature enhances situational awareness and can significantly improve the response to emergencies.

The other options do not accurately reflect the purpose or function of conference-in capability. Exclusive communication with emergency responders would be counterproductive to the collaborative nature of emergency response, where multiple parties need access to information. The idea that it can prevent child callers from being heard misrepresents the function of conference-in, which is intended to facilitate communication rather than restrict it. Lastly, saying it is not used in emergency situations disregards the primary purpose of this capability, which is to enhance communication during emergencies by allowing multiple parties to participate in a conversation.