Which of the following is NOT typically considered an ancillary function?

In fire alarm system terminology, ancillary functions refer to services and features that are not primarily focused on fire detection and alarm activation but still support an overall safety and operational framework within a building.

Fire evacuation alarms are a central component of a fire alarm system, as they are critical for alerting occupants in the event of a fire. This function is integral to the system's primary purpose, which is to ensure safety by prompting a quick and organized evacuation.

In contrast, general paging, background music, and alerts for building security are ancillary functions because they provide supplementary benefits that enhance the functionality of a building without being directly related to fire emergency response. General paging helps in communication, background music may create a specific atmosphere or ambiance, and security alerts can enhance overall safety through monitoring, but they do not specifically activate in response to fire emergencies.

Therefore, fire evacuation alarms are not classified as an ancillary function because they are essential for the fire alarm system's primary role in life safety and emergency response.