Securing voice networks

Worried about the security concerns of a converged network? Learn the basics about VoIP threats and get some network design recommendations for locking it down.

As companies increasingly adopt Voice over IP (VoIP) to replace the traditional public switched telephone network (PSTN), more thought has to be given to securing users from a new array of threats. If this is a decision you and your company are in the process of making, understanding the security measures will help you prepare for the change.

Global Knowledge has a very good white paper that covers these threat areas:

  • Toll Fraud: the use of corporate resources by inside or outside individuals for making unauthorized toll calls.
  • Denial of Service Attacks: attacks typically aimed at the data network and its components that can have a severe impact on voice calling capabilities.
  •  Impersonation exploits: where a caller changes call parameters, such as caller id, to make the call

    look like it is originating from a different user. The caller id may be used to gain a level of trust about

    the caller, who may then proceed to get private information that might not have been otherwise given.
  • Eavesdropping: the ability for a hacker to sniff packets relating to a voice call and replay the packets to hear the conversation

This is a seven-page white paper that offers a concise guide for network design considerations and security recommendations; it provides a good starting point for further research. You can download it from the TechRepublic directory here: Securing Voice Networks.