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Uncovering the Dangers Of Telephony Denial-Of-Service

By Tom Seest

What Is Telephony Denial-Of-Service and How Does It Impact Cybersecurity?

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Telephony denial-of-service (TDoS) is a type of cyberattack that disrupts voice systems. This type of disruption can impact emergency 911, financial call centers, and other business voice services.
Attackers employ both manual and automated tactics to overwhelm a target network with calls. This may be done by impersonating call origins or launching distributed attacks that use multiple devices to call one specific number simultaneously.

What Is Telephony Denial-Of-Service and How Does It Impact Cybersecurity?

What Is Telephony Denial-Of-Service and How Does It Impact Cybersecurity?

How Can a Telephony Denial-Of-Service Attack Impact Cybersecurity?

Telephony denial-of-service (TDoS) is an abusive activity that floods your voice communications system with false calls in an effort to overwhelm it and render it unresponsive or even crash.
To protect your business from a TDoS attack, the best course of action is to implement a secure phone system. For starters, consider installing a Session Border Controller (SBC). SBCs act like firewalls that manage call requests. If you don’t already own one, it may be possible for your telephony service provider to install one for you.
Another way to protect your business from a TDoS attack is using software that blocks caller ID spoofing. This allows you to detect and stop malicious calls before they reach your system, saving you costly rework or an entire line outage.
Though TDoS attacks are not new, their potential to disrupt critical telephone services like 911 emergency numbers or financial call centers has made them increasingly commonplace. The FBI and Department of Homeland Security have issued public safety alerts in an effort to alert people of the potential threat; additionally, the Federal Communications Commission has suggested hospitals and other organizations adopt best practices for protecting their telephony systems from robocalls.
TDoS (Transient Denial of Service) is commonly employed to annoy or intimidate organizations that fail to pay their bills, but it can also be part of an extortion scheme. In this scenario, the attacker poses as a collections agent collecting an outstanding fee, prompting the victim to send out numerous automated billing statements that ultimately lead to a full-scale TDoS attack.
A centralized TDoS attack involves using a computer program to generate multiple calls simultaneously, while a distributed TDoS attacks multiple call sources with malware, causing them to programmatically call various destinations simultaneously. The most straightforward way to protect your business from TDoS attacks involves creating effective partnerships with upstream telephony service providers and installing an anti-spoofing solution that will block spoofed phone calls.

How Can a Telephony Denial-Of-Service Attack Impact Cybersecurity?

How Can a Telephony Denial-Of-Service Attack Impact Cybersecurity?

How Does Telephony Denial-Of-Service Impact Cybersecurity?

A TDoS attack is a type of cyberattack in which an attacker floods a network with calls. These can be devastating for your VoIP system, blocking incoming and outgoing calls and even causing 911 phone lines to go down or disrupt emergency services.
Telephony is an integral component of communication for businesses, governments, and individuals alike. However, it also presents risks and vulnerabilities like malware, viruses, and other malicious threats.
In addition to traditional threats, VoIP systems may face other contemporary dangers like telephony denial-of-service (TDoS). TDoS attacks are unfortunately common and can have devastating effects on your business operations.
TDoS attacks can take both manual and automated forms. The latter utilizes social networks to encourage people to flood a specific number with calls, which is an effective way to overload PBX or trunk servers. Still, it is difficult to identify the source of the attack.
These types of attacks are frequently employed as a method to gain access to sensitive information. For instance, they could be employed in extortion schemes where an attacker impersonates a collections agency representative and threatens your call center with floods of calls if you don’t pay the fee demanded.
Another commonly employed tactic is spoofing, in which phone numbers of callers are altered to make it difficult for victims to identify who is threatening them. These attacks can be particularly hazardous when conducted against hospitals or emergency responder lines.
Organizations looking to protect against a TDoS attack should consider taking a layered approach. They should implement strong passwords on their PBXs and coordinate with their VoIP providers so they can monitor and respond promptly to any events related to TDoS activity.
They should also consider investing in call recording software to capture any abusive calls and provide evidence to law enforcement. Furthermore, employees should be reminded to safeguard personal identifying information and not share it with an attacker.
Despite these precautions, TDoS remains a real and growing threat. It can cause communication disruption as well as loss of business revenue.

How Does Telephony Denial-Of-Service Impact Cybersecurity?

How Does Telephony Denial-Of-Service Impact Cybersecurity?

What Can I Do to Safeguard My Business from Telephony Denial-Of-Service in Cybersecurity?

TDoS attacks are becoming an increasing danger to businesses. Not only can they cause financial loss and damage to a company’s reputation, but they may even force employees out of work.
Businesses should take proactive measures to secure their network against telephony denial-of-service attacks. By installing firewalls and encrypting data, businesses can reduce the chances of hackers gaining access to sensitive information.
Maintaining a backup of all company data is an essential security measure. Doing so guarantees your information remains protected should anything go awry with your systems. You can back up data either manually or using an automated process; either way, make sure all important documents and information remain safe.
Backups are especially essential if your business relies on a database for sensitive information. If the databases become compromised, you could potentially lose months or years’ worth of invaluable data.
Another way to reduce the likelihood of telephony denial-of-service attacks is by making sure your phone lines are secured. A reliable phone service provider should be able to offer anti-spoofing and call-screening solutions that can shield your business from such assaults.
If your phone lines are vulnerable to TDoS attacks, the first step should be contacting both your local police department and the National Communications Integration Center (NCCIC) to report the problem. Additionally, document all calls made and their originating phone numbers.
Once you know about an attack, ask your telephone provider what steps they take to monitor and respond. Doing this could save you from incurring costly losses of revenue or creating a public relations nightmare.
To further protect your business, it is recommended that you utilize strong passwords for your phone system. Doing so will help prevent unauthorized access to your lines and should be a standard feature in all new telephone systems.
Telephony denial-of-service attacks (TDOSs) are not new, but cybercriminals are increasingly interested in creating botnets to launch these attacks against businesses. This is because DDoS attacks offer criminals a major source of income and have an impressive success rate.

What Can I Do to Safeguard My Business from Telephony Denial-Of-Service in Cybersecurity?

What Can I Do to Safeguard My Business from Telephony Denial-Of-Service in Cybersecurity?

How Can I Safeguard My Business From Telephony Denial-Of-Service In Cybersecurity?

Telephony denial-of-service attacks are cyberattacks that disrupt business communication. They can affect emergency response numbers, PBX systems, and call centers alike, ultimately posing one of the greatest risks to a company’s reputation.
There are many ways to protect your business from telephony denial-of-service attacks. These strategies include preventing malicious calls, training employees on spear phishing attacks, creating backups, and cooperating with upstream telephony service providers.
Aside from these security measures, it’s wise to create a baseline of normal network activity in order to detect large increases in traffic or any suspicious overloads that could indicate a DoS attack. Doing this will enable you to detect attempts at overwhelming your network and protect your business from being negatively impacted by such threats.
Another way to safeguard your business against telephony attacks is to develop a plan for responding in the event they take place. This should include establishing points of contact and an incident response team, as well as creating a disaster recovery plan that prioritizes systems and processes based on tolerable downtime.
Work with your upstream telephony service provider to develop a denial-of-service prevention agreement and acquire additional out-of-band contact numbers that allow staff members to communicate with customers during an attack. Doing this will reduce downtime for your business in case of an attack and make recovery much simpler if one occurs.
Maintain tight control over the amount of access your company has to critical data, including files and backup copies. Doing so can help minimize the damage a data breach may cause and stop bad actors within your organization from gaining access to sensitive information.
Encourage your staff to be aware of spear phishing attacks and not click any links or documents received via email. Furthermore, stress the importance of not responding to abusive or harassing phone calls; make sure they report such events directly to their supervisors.

How Can I Safeguard My Business From Telephony Denial-Of-Service In Cybersecurity?

How Can I Safeguard My Business From Telephony Denial-Of-Service In Cybersecurity?

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