From Call Boxes to AI: 250 Years of Public Safety Communications
By NTIA's Office of Public Safety Communications
When the United States was founded 250 years ago, calling for help meant ringing a bell, firing a cannon, or shouting in the street. Over the past two and a half centuries, Americans have repeatedly reinvented public safety communications, driven by a single objective: getting help where it’s needed, faster.
America's First Dispatch System: Call Boxes
The first true leap came in 1852, when Boston introduced telegraph-based fire alarm boxes—decades before the telephone was invented. Citizens could pull a lever to signal the central fire office, a revolutionary concept at the time. The model spread rapidly to hundreds of cities, and a parallel system was adapted for police communication through street corner call boxes. Those police boxes, however, were less about public access and more about allowing officers to check in with headquarters. Remarkably, Boston's original fire alarm telegraph system remains in service, providing a backup when modern 911 networks go down.
As automobiles transformed American life in the mid-twentieth century, they created a new communications challenge: how could motorists quickly summon help from miles away? The answer was roadside call boxes, installed along highways to connect stranded or endangered travelers with emergency services. In some remote and mountainous areas where cell coverage remains limited, those boxes continue to serve an important role today.
Radio: The Backbone in the Field
Since the 1930s, land mobile radio has been the backbone of first responder communications. Handheld radios gave firefighters, police, and EMS personnel the ability to communicate instantly while on the move—coordinating emergency response in real time, something no call box could ever accomplish. As these systems digitized, interoperability became increasingly important. Project 25, launched in the 1980s, established common standards to help responders from different agencies and jurisdictions communicate with one another. Despite this, interoperability challenges persisted and contributed to communications failures during major disasters, including during the 9/11 attacks.
911: The Number That Changed Everything
Perhaps the single greatest leap in public safety communications came in 1968 with the introduction of 911. Before then, Americans had to know the specific local number for police, fire, or EMS—an obvious obstacle during an emergency, when every second matters. A single, memorable, nationwide emergency number fundamentally simplified access to help. By the end of the twentieth century, 911 service was available to more than 90 percent of Americans.
From there, the system continued to improve. Enhanced 911, deployed in 1999, automatically routes a caller's location to the responding Public Safety Answering Point, saving valuable time during emergencies. Now, Next Generation 911 (NG911) is replacing legacy analog infrastructure with Internet Protocol-based systems, enabling faster and more precise location-based call routing and transfers, providing real-time sharing of incident data across 9-1-1 centers and first responders, and reducing outage risk through network redundancy. By transforming emergency communications into a modern digital platform, NG911 also creates new opportunities to incorporate artificial intelligence, helping dispatchers triage calls, summarize information, and route resources more quickly. To support this nationwide transition, NTIA recently released a study showing the estimated cost of implementing NG911.
FirstNet: A Network Built for our Nation’s First Responders
The terrorist attacks on September 11, 2001 exposed a critical weakness in America’s emergency communications systems. Public safety agencies struggled to communicate across jurisdictions, while commercial wireless networks became overwhelmed under extraordinary demand, hindering emergency response.
To help ensure those failures would never be repeated, Congress established FirstNet within NTIA to oversee the deployment of a dedicated nationwide broadband network for first responders. FirstNet addressed a critical gap. During major emergencies, first responders were often competing with the public for network capacity at the precise moments communications mattered most. Through priority and preemption capabilities, FirstNet helps ensure that first responders can maintain reliable communications when commercial networks are congested. Today, FirstNet has become an indispensable tool for public safety, supporting everything from disaster response to everyday emergency operations across the country.
Looking Forward
As we look to the future, NTIA is committed to strengthening the communications systems America’s first responders depend on. We are supporting the integration of AI, advancing the nationwide transition to NG911, ensuring universal broadband availability, and ensuring first responders have access to faster, more resilient, and more interoperable communications. From telegraph alarm boxes to AI-assisted emergency response, every generation of Americans has built on the innovations of those who came before. As our nation celebrates its 250th anniversary, public safety communications remain a powerful example of how American innovation continues to save lives. The technologies have changed dramatically since our founding, but the mission has not: ensuring that help arrives when it is needed most.
This is the third in a series of NTIA blog posts tied to America’s celebration of its 250th anniversary.