Resources For You

  1. 5 Essential Marketing Strategies for VoIP Businesses

    5 Essential Marketing Strategies for VoIP Businesses

  2. 5 Technologies Set to Revolutionise Webphones

    5 Technologies Set to Revolutionise Webphones

  3. 5 Unique Types of VoIP Gateways Explained!

    5 Unique Types of VoIP Gateways Explained!

  4. 5 Ways a Cloud PBX System Benefits Remote Work

    5 Ways a Cloud PBX System Benefits Remote Work

  5. 5 Ways SBCs Facilitate Unified Communications as a Service

    5 Ways SBCs Facilitate Unified Communications as a Service

  6. 5 Ways to Optimise ASR To Grow Profitability

    5 Ways to Optimise ASR To Grow Profitability

  7. 7 Additional Important Components of a VoIP Carrier Network Explained

    7 Additional Important Components of a VoIP Carrier Network Explained

  8. 7 Important Factors to Consider When Implementing LCR

    7 Important Factors to Consider When Implementing LCR

  9. 7 Ways to Optimize AHT

    7 Ways to Optimize AHT

  10. 9 Key Functions of an SBC Explained

    9 Key Functions of an SBC Explained

  11. 10 Factors to Consider While Choosing a Webphone

    10 Factors to Consider While Choosing a Webphone

  12. 10 Important Components of a VoIP Carrier Network Explained

    10 Important Components of a VoIP Carrier Network Explained

  13. 10-Point Security Checklist for VoIP Carriers

    10-Point Security Checklist for VoIP Carriers

  14. 10 Tips For Effective Implementation of LCR

    10 Tips For Effective Implementation of LCR

  15. 10 Webphone Features that Benefit Your Business

    10 Webphone Features that Benefit Your Business

  16. An Out of the Box Telecoms Network

    An Out of the Box Telecoms Network

  17. Are Call Centers Still Relevant in 2023?

    Are Call Centers Still Relevant in 2023?

  18. Automated Dialler vs Manual Dialler - Knowing the 7 Key Differences

    Automated Dialler vs Manual Dialler - Knowing the 7 Key Differences

  19. Call Center vs Contact Center - Understanding the Differences

    Call Center vs Contact Center - Understanding the Differences

  20. Choosing SIP over TCP,TLS and UDP in 2022

    Choosing SIP over TCP,TLS and UDP in 2022

  21. Class 4 Softswitch vs Class 5 Softswitch - Understanding the Difference

    Class 4 Softswitch vs Class 5 Softswitch - Understanding the Difference

  22. Combatting Covid-19 with Carrier-Grade Communications Solutions to Help Users Work Remotely

    Combatting Covid-19 with Carrier-Grade Communications Solutions to Help Users Work Remotely

  23. Comprehensive Cloud Softswitch Documentation

    Comprehensive Cloud Softswitch Documentation

  24. ConnexCS expands AnyEdge SIP Load Balancer to India

    ConnexCS expands AnyEdge SIP Load Balancer to India

  25. ConnexCS for Africa

    ConnexCS for Africa

  26. ConnexCS WebPhone SDK Connector

    ConnexCS WebPhone SDK Connector

  27. Discover the Different Types of NAT: An Essential Guide for Network Administrators

    Discover the Different Types of NAT: An Essential Guide for Network Administrators

  28. Discussing the Future and Top 9 Benefits of WebRTC

    Discussing the Future and Top 9 Benefits of WebRTC

  29. DNO And DNC Lists - Everything Carriers Should Know

    DNO And DNC Lists - Everything Carriers Should Know

  30. Email and SMS Alerts

    Email and SMS Alerts

  31. Employers' Guide to Winning at Remote Work

    Employers' Guide to Winning at Remote Work

  32. Exploring the Top 10 Types of Web Phones in 2023!

    Exploring the Top 10 Types of Web Phones in 2023!

  33. False Answer Supervision Detection - The Ultimate Tool for Preventing VoIP Fraud

    False Answer Supervision Detection - The Ultimate Tool for Preventing VoIP Fraud

  34. Far-End NAT Traversal - An In-Depth Guide

    Far-End NAT Traversal - An In-Depth Guide

  35. Feature Releases for June 2024

    Feature Releases for June 2024

  36. From Cost Savings to Mobility - 15 Benefits of Web Phones for Businesses

    From Cost Savings to Mobility - 15 Benefits of Web Phones for Businesses

  37. Get Your FCC Registration Number in 5 Easy Steps!

    Get Your FCC Registration Number in 5 Easy Steps!

  38. How to Build Your API on ConnexCS

    How to Build Your API on ConnexCS

  39. How to Build Your Own Dialer (BYOD) – Part 1

    How to Build Your Own Dialer (BYOD) – Part 1

  40. How to Establish a VoIP Interconnect in 10 Easy Steps

    How to Establish a VoIP Interconnect in 10 Easy Steps

  41. How to Get Operating Company Number (OCN) in 4 Easy Steps

    How to Get Operating Company Number (OCN) in 4 Easy Steps

  42. How to Identify Robocall Scam Traffic - A Comprehensive Guide for Telecom and VoIP Operators

    How to Identify Robocall Scam Traffic - A Comprehensive Guide for Telecom and VoIP Operators

  43. How to Improve CX? Ensure your Call Center Agents are Happy!

    How to Improve CX? Ensure your Call Center Agents are Happy!

  44. How to Prepare for a VoIP Network Security Audit

    How to Prepare for a VoIP Network Security Audit

  45. How to Properly Prepare for Setting up a VoIP Interconnect

    How to Properly Prepare for Setting up a VoIP Interconnect

  46. How to Register for the Robocall Mitigation Database: A step-by-step guide!

    How to Register for the Robocall Mitigation Database: A step-by-step guide!

  47. How to Successfully Implement LCR is 5 Easy Steps

    How to Successfully Implement LCR is 5 Easy Steps

  48. How Using Web Phones Can Benefit These 10 Industries?

    How Using Web Phones Can Benefit These 10 Industries?

  49. Importance of Balancing Cost Minimization and Reliable Call Quality when implementing LCR

    Importance of Balancing Cost Minimization and Reliable Call Quality when implementing LCR

  50. Introducing ConnexCS WebPhone

    Introducing ConnexCS WebPhone

  51. Introducing ConneXML - The Best TwiML Alternative

    Introducing ConneXML - The Best TwiML Alternative

  52. Introducing Smart CLI Select - An Effective Way to Improve your ASR

    Introducing Smart CLI Select - An Effective Way to Improve your ASR

  53. LTE vs VoLTE: Diving Into The Differences

    LTE vs VoLTE: Diving Into The Differences

  54. Operating Company Numbers (OCN) - Understanding Function, Importance and Relevance

    Operating Company Numbers (OCN) - Understanding Function, Importance and Relevance

  55. Populating Our Support Area With Cloud Softswitch Video Guides

    Populating Our Support Area With Cloud Softswitch Video Guides

  56. Predictive Dialler vs Progressive Dialler - Understanding the Differences

    Predictive Dialler vs Progressive Dialler - Understanding the Differences

  57. Preview Dialler vs Power Dialler - Understanding Top 5 Differences

    Preview Dialler vs Power Dialler - Understanding Top 5 Differences

  58. Rate Card Profit Assurance

    Rate Card Profit Assurance

  59. Redundant Redundancies (Backups of backups)

    Redundant Redundancies (Backups of backups)

  60. Revolutionise Your Outbound Calls - 8 Types of VoIP Diallers Explained

    Revolutionise Your Outbound Calls - 8 Types of VoIP Diallers Explained

  61. Scalability – Grow at Speeds That Suit You

    Scalability – Grow at Speeds That Suit You

  62. ScriptForge – Javascript Routing

    ScriptForge – Javascript Routing

  63. Simplifiying our Softswitch Pricing

    Simplifiying our Softswitch Pricing

  64. SIP 101 - The Best Guide of 2022

    SIP 101 - The Best Guide of 2022

  65. The 3CX Supply Chain Attack - Understanding Everything That Happened

    The 3CX Supply Chain Attack - Understanding Everything That Happened

  66. The 5 Best Strategies for Mitigating Robocall Scams

    The 5 Best Strategies for Mitigating Robocall Scams

  67. The Anatomy of Robocall Scams

    The Anatomy of Robocall Scams

  68. The Art of Cost Optimization - Least Cost Routing and Its 7 Benefits

    The Art of Cost Optimization - Least Cost Routing and Its 7 Benefits

  69. The Best Multi-POP Cloudswitch

    The Best Multi-POP Cloudswitch

  70. The Essential Guide to Business Continuity Plans for VoIP Carriers

    The Essential Guide to Business Continuity Plans for VoIP Carriers

  71. The Essential Guide to Implementing STIR/SHAKEN

    The Essential Guide to Implementing STIR/SHAKEN

  72. The Ultimate Guide to STIR/SHAKEN

    The Ultimate Guide to STIR/SHAKEN

  73. Timeout Protections (SIP Ping, SST)

    Timeout Protections (SIP Ping, SST)

  74. TLS and 2FA Security on the ConnexCS Platform

    TLS and 2FA Security on the ConnexCS Platform

  75. Top 5 Alternative Marketing Strategies for VoIP Businesses

    Top 5 Alternative Marketing Strategies for VoIP Businesses

  76. Top 5 Call Center Challenges and How To Overcome Them

    Top 5 Call Center Challenges and How To Overcome Them

  77. Top 5 Important Types of VoIP Gateways Explained

    Top 5 Important Types of VoIP Gateways Explained

  78. Top 7 Strategies For Ensuring Call Quality While Minimizing Costs with LCR

    Top 7 Strategies For Ensuring Call Quality While Minimizing Costs with LCR

  79. Top 9 Indicators that Help You Identify a Bad Carrier

    Top 9 Indicators that Help You Identify a Bad Carrier

  80. Top 10 Points of Differences Between a Traditional and VoIP Carrier

    Top 10 Points of Differences Between a Traditional and VoIP Carrier

  81. Top 10 Types of Robocall Scams Explained!

    Top 10 Types of Robocall Scams Explained!

  82. Top 10 VoIP Vulnerabilities You Must Know About

    Top 10 VoIP Vulnerabilities You Must Know About

  83. Understanding Global RTP Servers (Lowest Latency Possible, High Availability)

    Understanding Global RTP Servers (Lowest Latency Possible, High Availability)

  84. Understanding Network Address Translation (NAT) - A Beginner's Guide

    Understanding Network Address Translation (NAT) - A Beginner's Guide

  85. Understanding the 9 Key Objectives of a VoIP Network Security Audit

    Understanding the 9 Key Objectives of a VoIP Network Security Audit

  86. Understanding the Complete Scope of a VoIP Network Security Audit

    Understanding the Complete Scope of a VoIP Network Security Audit

  87. Understanding the Crucial Role of Session Border Controllers in Carrier-Grade VoIP Networks

    Understanding the Crucial Role of Session Border Controllers in Carrier-Grade VoIP Networks

  88. Understanding VoIP Anycast Load Balancing

    Understanding VoIP Anycast Load Balancing

  89. Understanding What a PBX System is and How it Benefits Your Business

    Understanding What a PBX System is and How it Benefits Your Business

  90. VoIP Carrier Network Components - Understanding Session Border Controllers

    VoIP Carrier Network Components - Understanding Session Border Controllers

  91. VoIP Carrier Network Security - How to Conduct Security Audit?

    VoIP Carrier Network Security - How to Conduct Security Audit?

  92. VoIP Carrier's Ultimate Guide to Cleaning Up Their Traffic

    VoIP Carrier's Ultimate Guide to Cleaning Up Their Traffic

  93. VoIP Interconnects - Learning How VoIP Carrier Connect and Exchange Traffic

    VoIP Interconnects - Learning How VoIP Carrier Connect and Exchange Traffic

  94. VoLTE - An Evolution in Voice Communication

    VoLTE - An Evolution in Voice Communication

  95. WebPones Explained: Understanding Web-Based Telephonic Communication

    WebPones Explained: Understanding Web-Based Telephonic Communication

  96. WebRTC 101 - The Best Guide for Beginners

    WebRTC 101 - The Best Guide for Beginners

  97. What Are SIP Traces - A Beginners Guide

    What Are SIP Traces - A Beginners Guide

  98. What Are The Top 10 Essential Call Center KPIs?

    What Are The Top 10 Essential Call Center KPIs?

  99. What Are VoIP Gateways and How Do They Work? A Comprehensive Guide

    What Are VoIP Gateways and How Do They Work? A Comprehensive Guide

  100. What is a Contact Center and Why Does Your Business Need One?

    What is a Contact Center and Why Does Your Business Need One?

  101. What is Robocall Mitigation Database? A Guide for Carriers and VoIP Operators

    What is Robocall Mitigation Database? A Guide for Carriers and VoIP Operators

Top 10 VoIP Vulnerabilities You Must Know About

There is a peculiar characteristic about new technologies. While these are far better than the preceding ones, they turn out to be vulnerable to exploits preceding technologies were immune to.

Let's consider voice communication as an example. You could not hack or exploit the plain old telephone system without having physical access to it.

So locking up telephone terminals and switches and securing exchanges was enough for ensuring these systems were not hacked.

VoIP transformed the whole voice communication landscape. It was quick, cost-effective and offered far more features and control.

However, as VoIP operates over the Internet, it is vulnerable to a lot of internet exploits. These can be used to get into your VoIP system easily and scam you out of money or cause harm to your business.

Want your VoIP systems to stay secure? The best first step would be to learn about all the risks and vulnerabilities in VoIP Communication.

Let’s get started then, shall we?

Top 10 Risks and Vulnerabilities in VoIP Communication

When vulnerabilities and risks go unaddressed, they can result in severe financial and legal implications for your firm.

Knowing about these vulnerabilities and risks will help you secure your VoIP systems against such exploits.

Here’s the list then!

Caller ID Spoofing

Bad actors place calls from a phone number they’re not authorized to use and which don't route back to them. This is done to masquerade the origination of the call and reduce traceability.

This practice wasn’t common earlier as it was technologically intensive. However, recent years have seen a spike in such scams and the industry is locking down on it.

Caller ID Spoofing

We have already covered this topic in detail in our STIR/SHAKEN article.

Admonition: Did you know that you can configure ConnexCS so your customers can whitelist their own CLI with an automatic call-back verification?

Call Flooding

In a call flooding attack, an attacker floods the target VoIP server with too many requests or communications. When these requests exceed the server’s capacity. It severely hinders the functioning of the server.

Call flooding attacks have 4 types depending upon what type of requests they make:

  1. Registration Flooding
  2. Call request Flooding
  3. Call control Flooding
  4. Ping Flooding

Moreover, as the server is overwhelmed handling a call flooding attack, it may not be able to tend to any genuine call requests from customers.

This results in heavy losses for the firm. They burn through resources while handling the attack and aren’t able to generate revenue from processing genuine call requests.

Having an Intelligent AnyCast Load Balancer can be helpful in dealing with such situations.

Brute Force Attack

Brute force attacks are one of the more classic ways of computer hacking. In a brute force attack, the attackers use a computer algorithm and try different combinations of usernames and passwords to gain access to an account.

While this form of attack sounds too basic, it is quite effective. Most internet users still use easy-to-guess passwords.

Once the attackers have access to your VoIP system, they can start placing calls for free. These can be sold as a grey route (non-CLI route), or for AIT.

Voice over Misconfigured Internet Telephones (VoMIT)

VoMIT presents a serious threat to the security of a VoIP system. In this case, the attackers gain access to a system, often by dictionary or brute force attacks.

They then proceed to convert voice calls into audio files and transfer these to another location. They can gain access to any and all information being shared via voice calls.

Information from recorded calls can include but is not limited to usernames, passwords, confidential information, business secrets, PINs, etc. This can use this information to further cause harm and commit more cyber crimes.

AIT: Artificial Inflation of Traffic

An Artificial Inflation of Traffic attack involves placing a large number of calls for the sole purpose of creating traffic.

The end objective is often to create billable calls (mostly via a 3rd party, with a weak association) to create a charge which will be favorable to the associated party.

AIT attacks usually take place over revenue call share numbers, short codes and premium numbers which have a cost that is to be borne by the end-user.

Traffic can also be increased in other ways. Spam messages, missed calls forcing people to call premium numbers, short codes, exploiting billing systems, sending more billing messages than permitted, etc. are the options available to attackers.

DoS/DDoS

Denial of Service (DoS) or Distributed Denial of Service (DDoS) attacks have scammers or hackers divert a large amount of malicious traffic to a voice endpoint.

A DoS/DDoS attack is another classic form of cyber attack. It overloads the servers with enough traffic that it renders the servers unfunctional or results in a complete crash.

The amount of malicious traffic can completely overwhelm a VoIP system or even just the operators rendering it incapable of handling everyday business.

The operators, thus, can lose access to their own servers and suffer from server crashes that are not only time but resource intensive to fix.

Any crucial data that may be lost during such an attack adds additional recovery costs.

Similar to Call Flooding Attacks, an Intelligent Anycast Load Balancer can help a VoIP Operator manage the attack efficiently without incuring any loses.

Phishing

Phishing calls are an extension of Caller ID spoofing and are similar to email phishing scams. Scammers impersonate appropriate authorities and extract sensitive information such as login credentials, bank details, etc. from you.

Vishing Stats

Once they have this information, they use it to gain access to your personal data, profiles, bank accounts, etc.

Phishing calls not only result in losses in terms of money but also have led to identity thefts and misuse of stolen identities for more criminal activities.

Spam over IP Telephony (SPIT)

SPIT is another VoIP scam that functions similar to an email scam. Scammers send a pre-recorded message to unsuspecting users (Voice Broadcast).

When the users pick up and listen to the entire voice message, they’re charged for the duration of the call. Although the legitimacy of Voicebroadcast can be highly dependent on the data used and circumstances.

So whilst Voice Broadcast itself may not be illegal, it is very easy for the way it is being used to be illegal.

Missed Call Traffic

All telephony providers make money from air time when there is an active call. The cost of setting up a call and tearing it down is computationally expensive.

Therefore it is undesirable to have high amounts of call setups and teardowns without any talk-time. However, there is a more illicit activity going on with missed call traffic.

It can be used to validate if a number is working or not, this is useful information for many reasons. But with spoofed CLI it can leave a call record on a victim system.

When the victim calls back it would be charged at a premium rate, which ultimately the attacker will have an affiliation with.

Out-of-Date VoIP Systems

Scammers are always on the lookout for security lapses and loopholes to exploit. The only way to protect your firm against such scams is to audit and improve your system security regularly.

However, system administrators often overlook this and do not patch their VoIP system with the latest security updates. This leaves them vulnerable to multiple forms of cyber attacks.

Some VoIP switches are advertised as “anti-hack”; this is ultimately because the system itself is insecure, but instead of fixing the route of the problem it has to be hardened by a 3rd party solution.

With that, we conclude our list of top VoIP risks and vulnerabilities!

Ending Notes

Having the right knowledge is the best start to keeping your VoIP systems safe and secure. Knowing the top attacks and what vulnerabilities they exploit can help you erect the right defences to counter them.

The industry as a whole is actively taking action to curb the nuisance of cybercriminals. However, it is always advisable to be proactive and spend wherever necessary to keep your systems secure.

So what are you going to do to secure your VoIP systems?