Voice over Internet Protocol (VOIP) refers to the transmission of speech across data-style networks. This form of transmission is conceptually superior to conventional circuit switched communication in many ways. However, a plethora of security issues are associated with still-evolving VOIP technology. This publication introduces VOIP, its security challenges, and potential countermeasures for VOIP vulnerabilities.
, Walsh, T.
and Fries, S.
Security Considerations for Voice Over IP Systems, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=150222
(Accessed September 21, 2021)