What is the primary function of conference-in during an emergency call?

The primary function of conference-in during an emergency call is to connect multiple callers to share information. This allows emergency dispatchers to bring in other responders, such as fire fighters, police, or medical personnel, as needed, to ensure that everyone involved in the situation has access to the same information. By enabling real-time communication among multiple parties, it enhances coordination and response efforts, ultimately improving the effectiveness of the emergency response.

By contrast, the other options either focus on irrelevant aspects of the communication process or don't align with the primary intent of facilitating collaboration during emergencies. For instance, options like hearing background noise or dictating responses do not serve the purpose of increasing situational awareness and collaborative response among emergency workers. The ability to conference-in additional callers is crucial for sharing critical updates or instructions that can aid the overall response to an emergency.