January 22, 2012

1.3.6 Telephony


When telephone technology is married with information technology, the result is known as telephony. A breach in your telephony infrastructure is just as devastating as any other violation and can lead to the loss of valuable data.

Telephony is the technology associated with the electronic transmission of voice, fax, or other information between distant parties using systems historically associated with the telephone.

Internet telephony is the use of the Internet rather than the traditional telephone company infrastructure and rate structure to exchange spoken or other telephone information. The term is used frequently to refer to computer hardware and software that performs functions traditionally performed by telephone equipment.

As more organizations migrate from land lines to Voice over IP (VoIP) for cost savings and agility, security is increasingly important for Internet Telephony. VOIP can be easily sniffed with tools such as Cain & Abel and is susceptible to Denial of Service (DoS) attacks because it rides on UDP. There is also the outage issue with VoIP in cases where the data network goes down and you lose the telephony as well.

Related terms include: POTS – plain old telephone system; PSTN – public switched telephone network; VoIP – voice over IP; PBX – private branch exchange; SPIT – spam over Internet Telephony.

  • http://www.webopedia.com/TERM/T/telephony.html
  • http://searchunifiedcommunications.techtarget.com/definition/Telephony
  • CompTIA Security+ Study Guide: Exam SY0-301, Fifth Edition by Emmett Dulaney

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