Securing VoIP Networks: Threats, Vulnerabilities, and Countermeasures

Chapter 1

^1. The Global Information Security Survey 2005 by Ernst & Young notes that since 2005, compliance with regulations is the key driver of security investment, considered even more important than the threat of viruses and worms.

^2. www.iso.org/iso/en/prods-services/popstds/informationsecurity.html

^3. STP is one of the fundamental components of the PSTN, which routes signaling messages to other STPs to establish, manage, or disconnect a call. Other components include the SCP (service control point) and SSP (service switching point).

^4. Note that although in mobile networks the client devices are authenticated, the network is not necessarily authenticated.

^5. Network Reliability After 9/11. A Staff White Paper on Local Telephone Exchange ...