This note is to make
you understand what Voice over IP (VoIP) systems are, their basic architectures,
and the underlying protocols and provides a basis for your own research and
development in this area.
This note covers the
following topics: IP Telephony, Transporting Voice by Using IP,Session
Initiation Protocol (SIP), IETF Structure and Internet Standards Process,
SIP-based VoIP Lab, Socket Programming--Traceroute, IPv6 Socket Programming, UDP
Socket Programming, Waveform Function.
This book provides a collection
of 15 excellent studies of Voice over IP (VoIP) technologies. This book
introduces research strategies that address various issues with the aim of
enhancing VoIP quality.
This note covers the following topics:
technology and regulation, voip classification and the regulatory challenges,
methodology the system dynamics standard method, system dynamics model for
calea, calea background, calea causal loops, Calea stock and flow, model
analysis and policy lessons for Calea.
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
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.
This document is published by National
Institute of Standards and Technology, this covers the following: Overview of
VOIP, VOIP Equipment, Quality of Service Issues, Overview of VOIP Data
Handling ,Cost, Privacy and Legal Issues with VOIP, VOIP Security
Issues,Speed and Quality, H.323, SIP Gateway Decomposition,
Firewalls, Address Translation, and Call Establishment, Encryption and
IPsec, Solutions to the VOIPsec Issues, Planning for VOIP
Deployment, VOIP Risks, Threats, and Vulnerabilities.
Author(s):D. Richard Kuhn,
Thomas J. Walsh, Steffen Fries
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.
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.