Abstract
This chapter discusses several support protocols typically found in voice over Internet Protocol (VoIP) environments and some of the security implications that they bring with them. Many of the support protocols that are used by VoIP architectures enable services and features required for proper network operation. Some of these support protocols include: domain name system (DNS), trivial file transfer protocol (TFTP), hypertext transfer protocol (HTTP), and simple network management protocol (SNMP). DNS is a static hierarchical name resolution architecture that relies on the client/server communication for operation. Whenever someone browses the Internet, DNS is used in the background to translate host names into IP addresses so that the proper network destinations can be found. DNS is equally important in VoIP networks for its ability to resolve destination endpoint addresses or allow gateway registration to call servers and gatekeepers by host name. DNS is organized into myriad logical groupings called domains, which are further segmented into an endless number of subdomains.
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