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The Information Security Specialists

Telephony

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With all the focus on state of the art firewalls and perimeter security devices it is easy to over look the PABX telephone exchange as a source of a potential breach. Is there an unauthorised dial up modem connected to your network that can be accessed externally, or can someone gain access to the technical director’s voicemail?

These examples highlight a security breach but there are also operation breaches to consider. We have heard horror stories from clients that someone has managed to hack in to the PABX system and use this fraudulently to make international or premium rate calls, often leaving the company with a bill running into thousands or tens of thousands before it is identified as a problem. This really does highlight that prevention is far cheaper than cure.

Jump forward to look at recent developments and most companies are switching to Voice over IP (VoIP) because of efficiency and cost savings that are available. Simply replacing one technology with another does not remove the risks posed, it just introduces a different set that must be guarded against.

You still have the worry of protecting against voicemail hacking and fraudulent calls but now if a VoIP network is hacked it can provide another means by which to gain access to the corporate data network or the ability to monitor and redirect calls.

With VoIP there is also the threat of VLAN hopping if the network is poorly configured and any potential configuration, patching or published vulnerabilities that may affect the call server to consider.

One of the team is always willing to discuss any specific requirements or questions you might have so feel free to contact us.

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