Chapter 30
Security Issues in VoIP Telecommunication Networks
Xiaohui Yang, Ram Dantu, Duminda Wijesekera
30.1 Introduction
The Session Initialization Protocol (SIP) working group is dedicated to the development of SIP, specified as a standard under RFC 3261 and its extensions [1]. SIP communication was developed as an application layer protocol like HTTP to create, modify, and terminate multimedia sessions among endpoints. SIP was originally designed to signal IP-based voice communication (VoIP) but has expanded into the areas of video, file transfer, and instant messaging. SIP protocol provides only the signaling for connections but does not transmit data, in contrast to the Real-time Transport Protocol (RTP) [2], which transmits real-time ...
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