Telephone hacking is becoming widespread and is costing UK business thousands of pounds in unexpected telephone charges.

Did you realise your telephone line provider does not protect you against a hacker making calls through your system? It is your responsibility to make sure your telephone system is protected, would you leave your data network wide open without any protection?

Telephone hackers are only too aware that most companies protect their PC networks but when it comes to their phone system are totally oblivious to the dangers until it is too late. Minor tasks such as setting and changing voicemail passwords are often forgotten or people choose passwords that are easy to remember, and as such are easy to guess.

Telephone hackers take advantage of this vulnerability and randomly and routinely dial into a phone system to locate a voicemail mailbox that is not secure and dial out to anywhere they choose.

Our voice firewall is an anti-fraud system that monitors dialled calls and disconnects any unauthorised numbers, making it impossible for unauthorised numbers to dial out.


– Helps to prevent PABX fraud
– Reduces business costs and disputes with service providers
– Recognises unauthorised numbers and prevents connection
– On site configuration ensures high level of security
– Does not limit the functionality of the phone system
– Events log highlights blocked attempted calls and numbers
– Works with any brand, type or age of PABX

Introducing Voice Firewall

PABX hacking/phreaking/toll fraud is becoming increasingly widespread and is costing businesses globally $40 billion a year in unexpected telephone bills. PABX dial through fraud is carried out by fraudsters who hack into a phone system, often at night or at weekends when it is least likely to be detected, running up huge costs for the unsuspecting owners. You should ensure you take care of telephone system security to avoid such costs to your business.

There are even websites dedicated for phone system hacking/PABX dial through fraud which is now becoming big business for organised criminals rather than just a wheeze for internet geeks. These fraudsters know that most companies are oblivious to the threat of phone system hacking. Telephone network operators, whilst perhaps having fraud prevention departments to warn users about unexpected and excessive usage, are generally unsympathetic to companies that have been hacked and make the unfortunate victim pay.

What is phone hacking/phreaking/toll fraud?

No matter what you refer to it as, ‘PBX Hacking, Phone Hacking, phreaking, dial-through fraud, toll fraud- it all means the same thing: unfortunate and innocent businesses losing billions of pounds a year. It’s a hugely profitable activity for organized criminals, who hack into your telephone system and create a huge phone bill stuffed with illegal, premium rate calls to just about any location in the world. The worst thing is: you’ll be expected to pay.

How and when do hackers attack?

The hackers/phreakers can strike any system, and at any time. However, they usually mount an attack outside of office hours on public holidays, evenings or weekends as the likelihood of detection is lower. Voice Firewall stops the hackers immediately, ensuring you retain full control of your telephone system. Even before they carry out an attack by dialling the expensive numbers, the hackers will have already penetrated your telephone system without your knowledge. This is usually done via the programming ports or your voicemail boxes, as access codes are easily cracked no matter how often they are changed. Hackers then configure your system for their own use so they can use it for their own traffic at any time. See how one company was hacked in this BBC report.

How can Voice Firewall protect my telephone system?

Voice Firewall recognises unauthorised numbers and prevents them connecting to the main system, therefore nulling any opportunity the hacker has to penetrate the system. You can further configure the system to your own requirements and preferences. For example, you can determine which numbers should be blocked during office hours and out of office hours, so you won’t lose potential business from new callers that the system doesn’t recognise. Furthermore, Voice Firewall creates an event log showing blocked calls and numbers. You can also limit the number of simultaneous incoming and outgoing calls out of hours further enhancing your telephone system security


Even more Benefits of Voice Firewall

Voice Firewall has been specifically designed to be simple to install, and to work with any telephone system. Voice Firewall connects easily between the phone system and the network termination point, with no need to turn off trunk to trunk dialling if your system is using this functionality. What’s more, Voice Firewall does not limit ANY of the existing functionality of your telephone system. An overview of the benefits are shown below.

  • Connects easily between the phone system and the network termination point
  • Does not limit the functionality of the phone system
  • No need to turn off trunk to trunk dialling
  • If the call is blocked the caller hears an unobtainable tone
  • Event log showing blocked calls and numbers
  • You determine which numbers should be blocked during office hours and out of office hours
  • ISDN & ISDN2 Connections
  • Scaleable to any number of trunks
  • Can be mounted within a server
  • Can be rack mounted
  • UPS to protect in case of power loss

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