Server Technical Overview
This white paper examines the many different server types – Registrar Server, Redirect Server, Proxy Server, B2BUA (Back to Back User Agent), Events Server and Presence Server. It gives an overview of how each work and introduces Radvision’s SIP Server platform.
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Session Initiation Protocol for Enterprise SIP Solutions
This white paper provides an overview of SIP within the enterprise. This paper summarizes where SIP has come from, how it works, and what makes it such a useful enabling protocol. It then describes how SIP is used in applications including telephony, conferencing and messaging, back office integration and how it is being extended to provide innovative services and accommodate the requirements of a real time IP communication.
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Understanding SIP
This white paper is a gentle introduction to SIP. It look at the history and advantages of SIP as well as analysing a SIP session.
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What is SIP?
This white paper is an overview of SIP without much technical detail. It also covers some related protocols such as PINT, SPIRITS, SIGTRAN, MEGACO, ENUM, WTA and TRIP.
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SIP - Protocol Overview
This white paper is a good technical overview of SIP. It introduces the main SIP entities, presents a fairly detailed explanation of the SIP messages and shows the SIP call flows for session establishment and termination, redirection and proxying. It also introduces Session Description Protocol (SDP).
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Session Initiation Protocol
This white paper is a good technical overview of SIP. It introduces the main SIP entities, presents a fairly detailed explanation of the SIP messages and shows the SIP call flows for session establishment and termination, redirection and proxying. It also introduces Session Description Protocol (SDP). This white paper is similar to the previous paper by Radvision but is a little more detailed.
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A SIP of SIP
This white paper explains why SIP is a powerful real-time collaboration protocol. This document provides background information on SIP and touches the wide variety of applications whose implementation is either made easier or made possible, via SIP. This document concludes with a set of questions and answers on SIP.
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Comparison of H.323 and SIP for IP Telephony Signaling
Two standards currently compete for the dominance of IP telephony signaling: the H.323 protocol suite by ITU-T, and the Session Initiation Protocol (SIP) by IETF. This paper investigates and compares these two protocols in terms of Functionality, Quality of Service (QoS), Scalability, Flexibility, Interoperability, and Ease of Implementation. Similar scenarios for both Protocols are considered – particularly scenarios that involve a gatekeeper for H.323, and a Proxy/Redirect server for SIP.
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Traversal of VoIP and Video-Data via Firewalls and NATs
This white paper gives an introduction to Firewalls and Network Address Translation devices and how IP voice and video traverse the network. It presents some potential solutions to the problems encountered and looks at some of the issues with each.
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SIP Architecture with NAT (Version 1.0)
This white paper the general requirements for establishing a SIP infrastructure over the Internet. In particular it looks at Network Address Translation and the techniques used (UpnP, ALG, STUN, Comedia and TURN) and some analysis of them. It proposes several architectures suitable for an ISP.
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The SIP Protocol and Firewall Traversal
This white paper discusses some of the problems with using SIP and firewalls. Solution based on Ingate and Intertex firewalls are presented.
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