What Happens When 80,000 Robocalls Hit a Single Base in One Month?

Picture the phone system at a major military installation. Now picture it buried under 80,000 spoofed robocalls in a single month. That was the reality at Wright-Patterson Air Force Base. At Elmendorf Air Force Base, the problem escalated into a full Telephony Denial of Service (TDoS) attack that took down phone systems and services entirely.

For most organizations, a flood of robocalls is an annoyance. For the U.S. Air Force, one of the largest operators of military bases in the world, it was a threat to operational effectiveness and national security.

Here is how the USAF hardened the voice side of its digital perimeter, and what the rest of us can learn from it.

The Scale of the Challenge

The USAF is not a typical enterprise. It employs over 150,000 civilian personnel and more than 425,000 active-duty members, not counting contractors, National Guard, and Reserve members. It operates 59 bases in the U.S. and 23 bases across three continents, plus 89 Air National Guard units.

Every one of those locations depends on a working voice network. And every one of them is a target.

The attacks came in several forms:

  • Spoofing and impersonation. Bases like Eglin AFB received large volumes of calls where the caller deliberately sent false Caller ID information. Once someone answered, the fraudster would try to sell something or use social engineering to pry loose sensitive information.
  • Robocalls at overwhelming volume. Wright-Patterson AFB alone was hit with 80,000 spoofed robocalls a month, degrading day-to-day operations.
  • A TDoS attack. At Elmendorf AFB, a flood of unauthorized and malicious inbound calls knocked out phone systems and services. This is exactly what TDoS is designed to do: a distributed denial of service attack that targets a voice network by flooding it with calls so it can no longer be used for legitimate communication.

The Threat Hiding on the Inside

External robocalls were only half the story. The Department of Defense also had to worry about the insider threat.

An "insider" is anyone who has been granted access to a DoD information system, whether a service member, a civilian employee, or a contractor. The USAF has a Cyber Defense mission to monitor, collect, and analyze calls traversing its network, watching for adversaries trying to collect and exploit sensitive information.

That raises a question most organizations never think to ask: do you actually know what is happening on your voice network right now? Who is calling in, who is calling out, and whether sensitive information is quietly walking out the door over a phone line?

The USAF needed more than a robocall filter. It needed organization-wide visibility and control over all inbound and outbound call activity, plus the ability to record encrypted calls for operational security.

The Solution: One Platform at the Edge of the Network

The USAF deployed the SecureLogix Call Defense™ Call Security System, which brings together four capabilities in a single platform:

  • A voice firewall that blocks bad calls before they reach the network.
  • Voice intrusion prevention that detects call-pattern attacks and anomalies.
  • Analytic reporting for full visibility into voice network usage.
  • Call recording for operational security and insider-threat monitoring.

The Call Defense System sits at the edge of the voice network and sorts good traffic from bad in real time. It protects SIP, TDM, and hybrid networks, works with any voice system vendor, and can be deployed on premises, virtually, or in the cloud. In short, it secures voice networks from unauthorized access, malicious calls, TDoS attacks, toll fraud, call pumping, and other threats.

The Results

The outcomes speak for themselves:

  • SecureLogix blocks over 2.1 million fraudulent calls annually for the USAF.
  • At Eglin AFB, SecureLogix blocks an average of 20,000 spoofed calls every month.
  • The USAF gained the ability to monitor and record incoming and outgoing calls, on and off base, and watch for the improper disclosure of sensitive information.
  • The organization strengthened its security perimeter against call-related insider threats.

As a former Deputy Chief of Staff for Communications and Information, and Deputy Chief Information Officer at Headquarters U.S. Air Force put it:

"SecureLogix empowers us to secure our mission critical voice network infrastructure and services."

Having an efficient and secure information enterprise is part of the USAF's overall Digital Air Force strategy, and voice security is a core piece of it.

Why This Matters Beyond the Military

You might assume TDoS and voice-based attacks are a problem unique to high-profile government targets. They are not, and the trend is moving in the wrong direction.

TDoS attacks are increasingly launched using botnets, compromised PBX and VoIP systems, and even "DDoS-as-a-service" offerings sold on underground markets, which makes them a mainstream tool for extortion and disruption (BankInfoSecurity). In August 2024, a single TDoS attack disrupted emergency call systems across seven large counties and 21 public safety agencies in one U.S. state (National Law Review). The FBI has warned that these attacks have targeted the administrative lines of Public Safety Answering Points, and in at least one case disabled a hospital's 9-1-1 access (FBI IC3).

The broader numbers reinforce the point. According to the SecureLogix 2022 Call Security Report, about 5% of all inbound call traffic to businesses is threatening, fraudulent, or harassing, and SecureLogix blocks more than 116 million threatening calls a year for its customers. Meanwhile, an ENEA report found that 76% of enterprises lack sufficient voice security (ENEA Mobile Network Security 2024).

If the U.S. Air Force, with all its resources, needed a dedicated platform to secure its voice network, it is worth asking whether your organization is any better protected.

The Good News: This Is a Solvable Problem

Voice network security can feel overwhelming, but it does not have to be. The same technology that protects one of the world's largest base networks can protect a hospital, a bank, a law firm, or a city's emergency services.

The key is treating your voice network the way you already treat your data network: with a firewall at the edge, real-time visibility into every call, and the ability to block bad traffic before it does damage.

For 25+ years, SecureLogix has helped enterprises and government agencies do exactly that, and our team is ready to help you do the same.

Speak with a Voice Security Expert to see how the Call Defense™ Call Security System can protect your voice network from robocalls, spoofing, and TDoS attacks.