VoIP Security
Harsh Kupwade Patil, Southern Methodist University
Dan Wing, Cisco Systems
Thomas M. Chen, Swansea University
1 Introduction
H.323 and Session Initiation Protocol (SIP) are the two standardized protocols for the realization of VoIP.1,2 The multimedia conference protocol H.323 of the International Telecommunication Union (ITU) consists of multiple separate protocols such as the H.245 for control signaling and H.225 for call signaling. H.323 is difficult to implement because of its complexity and the bulkiness that it introduces into the client application.3 In contrast, SIP is simpler than H.323 and also leaner on the client-side application. SIP uses the human-readable protocol (ASCII) instead of H.323’s binary ...
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