When dialed, it connects the caller to a Public Safety Answering Point (PSAP), where a trained dispatcher answers the call, assesses the nature of the emergency, and dispatches the appropriate emergency services, such as police, fire, and ambulance.

The key features of 911 services include:

• Universal Access: 911 is a universally recognized number across the United States and Canada, providing a single point of contact for all types of emergencies.

• Rapid Response: The primary purpose of 911 is to ensure a quick response to emergencies. The system is designed to route calls to the nearest PSAP based on the caller's location.

• Location Identification: Enhanced 911 (E911) systems automatically provide the caller's location to the emergency dispatcher, aiding in faster response times, especially important in situations where the caller is unable to communicate their location.

• Trained Dispatchers: Calls to 911 are answered by trained dispatchers who can assess the situation and dispatch the appropriate emergency services. They are also trained to provide immediate guidance on life-saving procedures over the phone, such as CPR instructions.

• Integration with Various Emergency Services: The 911 system is integrated with various emergency services like police departments, fire departments, and medical emergency services, allowing for coordinated response efforts.

• Continuous Evolution: The system has evolved with technology, moving towards Next Generation 911 (NG 911) systems that aim to enhance capabilities with features like text-to-911, image and video sharing, and better location accuracy.

The 911 service is a critical component of public safety and emergency response infrastructure, providing a quick, reliable way for individuals to request emergency assistance.