Expert Opinion
Dmitry Sumin: How Can Operators Minimize Blocking Legitimate Traffic While Preventing Fraud?
Blocking the entire compromised originating or terminating ranges of voice traffic leads to unnecessary losses.

It’s no surprise to both telecom professionals and customers that calls to certain Pacific Island countries, such as Vanuatu, are blocked for calls from many mobile networks. How did it come to this?
The reason for this massive inconvenience for customers is that fraudsters often use high-cost call destinations for various kinds of schemes. In such fraud scenarios, fraudsters hijack calls and direct them to their own or leased lines to profit from businesses or individual subscribers. Short-stopping, Private Branch Exchange hacking, Wangiri and Wangiri 2.0 calls, and callbacks are a few examples of these fraud schemes.
Operators face a storm of trouble tickets and disputes due to fraud, so they prefer to block these high-cost call destinations altogether. The percentage of fraudulent traffic to these destinations is very high compared to legitimate traffic.
Widespread industry use of fraud number databases leads to the approach of blocking entire country codes. Credible organizations and regulators, such as GSMA, CFCA, TUFF and BEREC, provide such databases. These databases are also sold commercially and operators often block the full number ranges listed in these databases.
Fraudsters now use allocated and live numbers
However, there’s a problem. Fraudsters don’t just conduct attacks by using unallocated numbers which have not been assigned to a specific service provider. They now use more and more allocated number ranges, with some numbers even assigned to real customers. An allocated number is a number that belongs to a network operator under a national numbering plan.
Previously, operators could just block unallocated numbers used in fraud attacks and prevent fraud without affecting legitimate traffic. This is no longer possible. In fact, our team has estimated that more than 75 percent of fraud attacks come from and to allocated number ranges. Moreover, 50 percent of the numbers in those ranges are assigned to real subscribers.
It’s clear that when allocated number ranges are blocked, legitimate traffic gets blocked as well. This leads to revenue loss, dispute tickets from customers and customer churn.
The issue with the current blocking process
Before discussing the new approach to blocking fraud, let’s look at the main stages of the aforementioned fraud attacks that use call hijacking. First, the fraudster gains access to the originating A number range, for example, by hacking a corporate PBX. Then the traffic from this compromised range to specific terminating B ranges gets short stopped. This means that the call is hijacked to an expensive destination country. The hackers and the rogue carriers share the revenue generated by the fraudulent calls, which are billed to the end customer or another carrier in the routing flow.
If we block the entire originating A range, we will lose legitimate traffic to other destinations. And if we block the terminating B range, then we will also block the legitimate traffic coming from non-fraudulent A numbers, as in the case of blocking the country codes of Pacific Island nations.
The new approach: Granular blocking of A and B ranges for the duration of the attack
As you can see, blocking the entire compromised A or B range leads to unnecessary losses. How can we improve our approach to stopping fraud so that legitimate traffic is unaffected?
Our practice at AB Handshake shows that this can be done by introducing two adjustments to the blocking process. First, once an attack is detected, you should only block the traffic from the compromised A range to the compromised B range. Second, the ranges should be unblocked immediately after the attack is over.
This new approach allows service providers and transit carriers to avoid excessive blockages and minimize revenue losses while preventing fraud. But to realize this new approach, there has to be a specific fraud detection process. However, not every anti-fraud tool is capable of this. Let’s see what features an anti-fraud tool must have to achieve this.
Maximum granularity and accuracy of detection
If the tool is to detect only the compromised A and B ranges without affecting legitimate traffic, it has to offer maximum granularity of detection. This requires the highest possible accuracy in detection. An important term to understand here is “false positive,” which is a false indication of fraud when it isn’t present. In our case, regular and valid traffic could get mistakenly marked and treated as fraudulent. The anti-fraud tool must employ the latest technology, such as artificial intelligence and machine learning, to provide the highest detection accuracy and maximum granularity.
Detection speed
The most important aspects of a real-time approach are constant monitoring of live traffic and the speed of fraud detection. Ideally, the time frame between detection and response should be close to zero. This means that the least amount of fraudulent calls will get through. The solution should also detect the end of the attack with maximum speed so the ranges can be unblocked immediately to avoid revenue loss.
Real-time control
The anti-fraud solution must be integrated with the operator’s network control components on a signaling level. This ensures it can block the compromised ranges immediately when the attack starts and unblock them exactly when it’s over.
Advanced anti-fraud tools are a must
To satisfy all of the criteria above, the anti-fraud solution must use the latest technology available. One example is the call validation technology, which works on a call-by-call basis and has 100 percent detection accuracy of all known fraud types. Another option is using an anti-fraud tool with an AI engine. Such tools employ machine learning algorithms and offer up to 99 percent fraud detection accuracy.
A low-cost alternative to AI-powered tools would be the widespread adoption of real-time API solutions. Such APIs send real-time alerts when an attack is detected. The big data included in such alerts comes from hundreds of networks worldwide monitored by an AI anti-fraud tool. This alert shows the compromised A and B ranges and the types of fraud schemes they are used for. The API will also notify operators when the attack is over so they can unblock the ranges safely and avoid revenue loss.
A solution in times of crisis
At a time when the volume of international voice traffic and the revenue it generates is falling globally because of the competition from WhatsApp, Viber and VoIP services, the issue of telecom fraud is especially troublesome. Fraudsters have become more and more adept at masking their attacks as legitimate traffic, so it is no longer enough just to block ranges from databases. Blocking fraud must now be done with maximum accuracy and granularity to avoid the disruption of legitimate traffic and the resulting loss of revenue.
The new approach of blocking the compromised A and B ranges only for the duration of the attack will help operators minimize unnecessary losses while effectively preventing fraud. The first step is to have the right anti-fraud tool for this task. Thankfully, the rapidly advancing technology used by anti-fraud vendors is already capable of realizing this new approach.
Dmitry Sumin is head of products at the AB Handshake Corporation. A graduate of the Moscow State University, he has over 15 years’ experience in international roaming, interconnect and fraud management. Having previously worked for both MNO and MVNO/MVNE operators, he has a good understanding of different technologies and business models within the telecommunications market. This piece is exclusive to Broadband Breakfast.
Broadband Breakfast accepts commentary from informed observers of the broadband scene. Please send pieces to commentary@breakfast.media. The views reflected in Expert Opinion pieces do not necessarily reflect the views of Broadband Breakfast and Breakfast Media LLC.
Broadband Mapping & Data
Tom Reid: Accountability in Broadband Maps Necessary for BEAD to Achieve Mission
The sheer magnitude of the overstatements in the FCC’s map makes the challenge process untenable.

With millions of American households stranded in the digital desert, we need to achieve accountability in broadband to make sure the Broadband Equity, Access and Deployment funding achieves its mission. The broadband gaps can be readily identified despite the air of mystery surrounding the topic.
Broadband improvements have been constrained for decades by inaccurate maps, yet the Federal Communications Commission continues to accept dramatically exaggerated availability and capacity claims from internet service providers. The cumbersome challenge process requires consumers and units of government to prove a negative — a logical fallacy.
The Reid Consulting Group and other parties, including Microsoft, have developed robust algorithms to reliably identify actual broadband availability. RCG utilizes Ookla Speedtest Intelligence data due to the large quantity of consumer-initiated tests. In Ohio, as an example, we draw on more than 16 million speed tests reflecting the lived experience from millions of households. We combine the speed test findings with FCC and Census data to deliver irrefutable identification of unserved and underserved locations.
Such methodologies offer State Broadband Leaders the opportunity to reverse the burden of proof in the BEAD program, requiring that ISPs submit concrete evidence supporting their availability and speed claims. As an example, in Ohio, RCG’s maps were accepted as proof of unserved status for the 2022 state grant program. BroadbandOhio then required ISPs to submit substantial proof in their challenge process. In other words, the ISP’s were tasked with proving a positive instead of expecting citizens to prove a negative.
ISPs and the FCC denounce crowdsourced data unless conducted under unusually restrictive conditions. The ISPs have successfully promoted unsubstantiated myths regarding the value of consumer-initiated speed tests.
Myth: Bad tests are because of poor Wi-Fi.
Reality: RCG eliminates speed tests with weak Wi-Fi and includes GPS enabled wired devices. Even first-generation Wi-Fi would saturate a 25 Megabits per second download and 3 Mbps upload connection.
Myth: Residents only subscribe to low-speed packages.
Reality: According to the National Rural Electric Cooperative Association, in areas where rural electric cooperatives offer broadband, 25 to 33 percent of rural subscribers opt for the top speed tier offered. We can clearly see this trend in areas where fiber has been deployed in recent years, as described later in this article.
Myth: People only test when there is a problem.
Reality: Network problems prompt tests, as do resolutions of problems. RCG recommends focusing on the maximum speed test results to eliminate this “unhappy customer effect.”
Finding the truth: Broadband and the lived experience
In Ohio, RCG analyzed more than 14 million consumer-initiated speed tests over a three-year period. The data reveals a clear pattern of carrier overstatement. The stark visual contrast between the two maps is hard to ignore — and while this study is focused on Ohio, the issue remains nationwide in scope. The sheer magnitude of the overstatements makes the FCC challenge process untenable.

Figure 1: Ohio Broadband Reality vs. FCC ISP stated coverage map.
RCG utilized the “maximum speeds ever seen” at a location for generating maps and coverage figures, but we also examined the results from the average of speed test. Switching between average and maximum speeds does not change the overall picture of broadband availability. As an example, Figure 2 focuses on an area around Bolivar, Missouri. Looking at the maximum speed turns Bolivar itself a deeper green, meaning “better served,” but the rural areas around Bolivar remain predominantly red, meaning “unserved.” The preponderance of evidence clearly demonstrates that much of the rural area around Bolivar remains unserved, even at maximum speeds.

Figure 2: Map visualization illustrating the difference between viewing average speeds in the Bolivar, Missouri area and maximum speeds documented.
When rating broadband availability in the Bolivar area at the Census block level and overlaying with ISP coverage claims at the H3 R8 level, you can see that many of the unserved and underserved areas have been reported as served to the FCC by ISPs (Figure 3).

Figure 3: Carrier overstatement small scale in Bolivar, Missouri. RCG speed map with FCC H3 R8 hexagon overlay.
Zooming out to examine the entirety of Missouri (Figure 4), the pattern of ISP overstatement becomes quite clear. According to the FCC maps, most of the state is served, whereas the analysis conducted by RCG shows that significant areas remain in need of broadband investment. As with Ohio, the scope of the overstatement in Missouri presents an unreasonable burden on the public to challenge.

Figure 4: Missouri reality vs. ISP Reports, March 2023.
Showing Progress: Change of State Analysis
Change-of-state analysis taps progressive releases of Ookla records to identify areas where broadband speeds have set new highs. This approach works not only for grant funded projects but also private investments. The area surrounding Byesville, Ohio (Figure 5) reveals a significant uptick in test volume, test locations, and speeds from 2020 to 2022. Side-by-side comparison shows a large number of “green” (served) speed test locations where there used to be only “red” (unserved) and “orange” (underserved) results. This change is a direct result of a Charter Communications Rural Digital Opportunity Fund deployment.

Figure 5: The unserved area around Byesville, Ohio before and after broadband deployment.
State Broadband Leaders can use these capabilities to document progress and identify lagging projects. Any service area will always exhibit a mix of speed test results. Even in an area like Byesville where fiber-to-the-home has been deployed, not all the location “dots” will turn green. However, the preponderance of evidence clearly shows that a funded ISP — in this case, Charter — has made good on its commitment to expanded broadband access. ISPs can help by conducting speed tests at the time of installation from the customer’s premises and by increasing minimum packages to 100/20 Mbps or higher.
There is no mystery to solve — we know how to identify areas lacking broadband services. For many rural Americans, even their telephone services have become unreliable, still dependent on the now-decrepit copper cables built in the 1940s through 1960s. We all depend on a healthy rural economy for our food, water and energy. Let’s make the commitment to build the infrastructure needed to bring these households into the internet age — starting by bringing reality and accountability to the availability maps.
Tom Reid is the president of Reid Consulting Group, a firm specializing in broadband. They work with clients to generate insights, create actionable plans, and identify funding sources to connect unserved and underserved areas. RCG’s engagements in eight states have delivered 6,000 miles of fiber construction with a total project value of $1.6 billion and has secured over $330 million in grant funds on behalf of clients. This piece is exclusive to Broadband Breakfast.
Broadband Breakfast accepts commentary from informed observers of the broadband scene. Please send pieces to commentary@breakfast.media. The views expressed in Expert Opinion pieces do not necessarily reflect the views of Broadband Breakfast and Breakfast Media LLC.
Expert Opinion
Johnny Kampis: Broadband Industry Hopeful to Get Waivers from Biden Administration Protectionist Policies
The Buy America mandate could seriously hamper the Broadband Equity, Access and Deployment program.

In a presidential administration rife with protectionist policies, the broadband internet industry is optimistic it will receive waivers from the “Buy America” mandate that threatens to derail plans to close the digital divide.
The National Telecommunications and Information Administration is likely to announce state funding allocations for the $42.5 billion Broadband Equity, Access and Deployment program by the end of June. That is the biggest piece of the taxpayer-funded pie allocated by Congress to extend broadband infrastructure across the U.S. over the next several years.
But, as the Taxpayers Protection Alliance has reported, broadband industry leaders say the Buy America mandate could seriously hamper the effort. As part of the mandate, the Biden administration has said that at least 55 percent of the component parts of a product used in federal construction projects must be sourced domestically. That rule applies to any infrastructure project, but broadband has taken center stage recently with the BEAD funding imminent.
Because fiber-optic cables primarily used in broadband infrastructure projects include materials such as aluminum, copper, glass, plastic and steel that are primarily manufactured in other countries, under the current rules they would be forbidden. And many other important cogs in the broadband machine, such as routers and switches, are mostly made overseas. Even the left-leaning Brookings Institution noted the policy “could put broadband deployments as risk.”
Fortunately, the Biden administration is softening on its Buy America policies — at least in the broadband industry. NTIA chose earlier this month to exempt several categories of equipment such as broadband routing equipment, transceivers and antennas from the domestic manufacturing requirements in the Enabling Middle Mile Infrastructure Program. The agency said that “although there are public and private efforts underway to increase manufacturing capacity… industry will not be able to address shortages of the manufactured products and construction materials required for middle mile network deployment within the timeframes required.”
Broadband Breakfast pointed out in a recent article that it will take several years to ramp up production of semiconductors in the U.S. and the BEAD program has set a five-year timeline for project completion.
“The estimates are that it would take at least, at a minimum, three to five years to bring a semiconductor chip plant to the U.S.,” said Pam Arluk, vice president of NCTA – The Internet & Television Association. “And even though the BEAD program is going to be over several years, that’s still just not enough time.”
The inherent difficulties in meeting the Buy America mandate, and the precedent now set with the middle mile program, provide optimism that waivers will likely be offered with BEAD. But that is just one of many infrastructure programs now being funded by taxpayers through federal recovery programs.
As President Joe Biden said in his State of the Union Address in February, “American-made lumber, glass, drywall, fiber optic cables…on my watch, American roads, American bridges, and American highways will be made with American products.”
Washington Post columnist Fareed Zakaria pointed out that what he calls the “Biden Doctrine” violates the spirit of the World Trade Organization and its framework of open trade. And another Post columnist, former Clinton administration Treasury Secretary Lawrence Summers, noted that protectionist policies tend to hurt more people than they help — giving as an example steel tariffs that aided 60,000 steel workers, but threatened the jobs of 6 million other workers in industries paying inflated prices for steel.
Strides in broadband waivers are a good sign, but the Biden administration must do more to curtail its protectionist policies as industries use economic recovery funds to build infrastructure in the coming years.
Johnny Kampis is director of telecom policy for the Taxpayers Protection Alliance. This piece is exclusive to Broadband Breakfast.
Broadband Breakfast accepts commentary from informed observers of the broadband scene. Please send pieces to commentary@breakfast.media. The views expressed in Expert Opinion pieces do not necessarily reflect the views of Broadband Breakfast and Breakfast Media LLC.
Expert Opinion
Angie Kronenberg: The FCC Must Act Now to Save the USF
While the USF remains vital in an ever-increasing connected world, it is in serious jeopardy of surviving.

Last week, the Senate Subcommittee on Communications, Media and Broadband held a hearing titled “The State of Universal Service.” The Universal Service Fund is our nation’s critical connectivity program that helps ensure that voice and broadband services are available and affordable throughout the country.
Since its creation by Congress in the 1996 Telecom Act, the USF has become a program that millions of families, community anchor institutions and small businesses rely on to get connected. It has been especially valuable for families and businesses that rely on it for work, school and telehealth at home.
The USF spends about $8.5 billion annually to help fund affordable connectivity in rural areas, low-income households, schools, libraries and rural hospitals. Today, the Federal Communications Commission is working to make high-speed broadband as ubiquitous as telephone service, and broadband is the essential communications technology the USF now supports.
While the USF remains vital in an ever-increasing connected world, it is in serious jeopardy of surviving. To fund the programs, telecom providers are required to pay a certain percentage of their interstate and international telecom revenues, known as the “contribution factor.” Typically, telecom providers collect these USF fees from their customers on their monthly bills.
However, the telecom revenues that fund the USF have declined over 60 percent in the last two decades. As a result, the contribution factor has skyrocketed from about 7 percent in 2001 to a historic high of about 30 percent today, as a higher portion of telecom revenues is needed to sustain the fund. That means certain consumers and businesses are now paying an additional 30 percent on top of their phone bills in order to fund the USF.
Telecom revenues continue to decline so rapidly because customers today rely more on broadband services and less on landline and mobile phone services, but broadband revenues do not pay into the USF. While the FCC has modernized each USF program to help support broadband service, it has not modernized its funding mechanism to require broadband services to pay into the Fund even though historically the agency has required supported services to be included in the contribution system.
Without intervention, the contribution factor is predicted to rise to 40 percent by 2025. This is unsustainable and puts the stability of the entire USF at risk. In fact, the contribution factor has become so high that it has led some groups to challenge the USF in federal court as unconstitutional, which also threatens the sustainability of the USF.
Reforming the USF funding mechanism is urgently needed and long overdue
Over 340 diverse stakeholders have come together as the USForward Coalition calling on the FCC to move forward with USF reform by expanding the contribution base to include broadband revenues. This solution is based on the recommendation in the USForward Report (that INCOMPAS helped commission), which was written by USF expert and former FCC official Carol Mattey.
The USForward Report explains that the most logical way to reform the contribution system and sustain the USF is to include broadband revenues in its funding assessment. Under this approach, the contribution factor is estimated to fall to less than 4 percent. It also means that the services that get USF support are paying into it, rather than solely relying on telecom customers, including those that have not made the switch to broadband, such as older Americans.
In fact, some members of Congress understand the urgency of reform and also want the FCC to act. The Reforming Broadband Connectivity Act, for example, is a bipartisan, bicameral bill that would require the FCC to reform the contribution system within one year.
Some question whether large tech companies should be assessed to contribute to the USF, and the short answer is “No.” Tech companies invest $120 billion each year in global internet infrastructure, and unlike broadband providers, these companies do not request or receive USF funding for these investments.
The FCC also lacks the authority to regulate tech companies and doing so would require Congress to act. This would further delay reform and expand the FCC’s regulatory authority over all online content and services — an overreach that many question as too broad since nearly every business today has an online presence and uses the internet to conduct business. Moreover, proposals to target certain tech companies risk skewing the online marketplace and competitive markets.
Some also question whether we still need the USF at all, and the short answer is “Yes.” While Congress allocated tens of billions for broadband, most of this investment is targeted for deployment, yet a significant portion of the USF programs focus on affordability. We not only have to make sure we build out our broadband networks, but also that communities can then afford to subscribe to these services.
The FCC should not wait to reform the USF. The USForward Report sets out a real plan that the FCC can and should implement. Congress should encourage the FCC to act now and save the nation’s critical connectivity program.
Angie Kronenberg is the president of INCOMPAS, where she manages the policy team and its work before federal, state and local governments, as well as leading the association’s efforts on membership and business development. This piece is exclusive to Broadband Breakfast.
Broadband Breakfast accepts commentary from informed observers of the broadband scene. Please send pieces to commentary@breakfast.media. The views expressed in Expert Opinion pieces do not necessarily reflect the views of Broadband Breakfast and Breakfast Media LLC.
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