This note covers the following topics: protocol overview, components, H.225, RAS , Q.931, H 235V2 security, H 323 & firewalls, sccpskinny, RTP and RTCP,SIP, sample sip session, request methods, request headers, replies, SDP and SIP fire
Author(s): NA
112 Pages
Voice over IP by Professor Richard Harris
This note covers the following topics: current state of the art in Internet Telephony, key protocols involved in VoIP and their roles in this new technology, limitations of current VoIP technology, key factors influencing the growth of Internet telephony services for global communications.
Author(s): Richard Harris
37 Pages
Voice over IP Protocols and Standards (PDF 20P)
This paper first discusses the key issues that inhibit Voice over IP (VOIP) to be popular with the users. This document discuss the protocols and standards that exist today and are required to make the VOIP products from different vendors to interoperate. The main focus is on H.323 and SIP (Session Initiation Protocol), which are the signaling protocols. We also discuss some hardware standards for internet telephony.
Author(s): Rakesh Arora
20 Pages
Security Issues and Countermeasure for VoIP (PDF 33p)
This paper focuses on these VoIP specific security threats and the countermeasures to mitigate the problem. At first, this paper gives a brief introduction of VoIP techniques: the network structure, network components, protocols and standards, data handling procedures, quality of service requirements, etc. Secondly, the paper discusses the VoIP specific security threats using the principle of CIA (Confidentiality, Integrity and Availability). The countermeasure to mitigate these threats is also discussed.
Author(s): Jianqiang Xin
33 Pages
