The document discusses the Session Initiation Protocol (SIP), which allows for multimedia communication sessions over IP networks. SIP establishes sessions for voice, video, messaging and other applications. It uses requests and responses to initiate sessions between users, locate users, invite them to sessions, and terminate sessions. SIP relies on user agents, proxy servers, redirect servers and registrar servers. It enables mobility and flexibility in setting up and modifying communication sessions across different devices.
The Session Initiation Protocol (SIP) is the dominant signaling protocol used in VoIP today. It is
responsible for the establishment, control and termination of sessions by exchanging ASCII-text-based
messages between the endpoints. This post goes through the basic components of SIP: messages and
logical entities.
Brief introduction into SIP protocol, how it works, common problems to solve. Tech. details about handshake, SIP Trunks and SIP trunking. Market research.
If you don't know what SIP is, what it is used for or why you should even care then this is the section for you. This presentation will go over the very basics of SIP and assumes no previous knowledge of SIP or really any other network experience either. Topics it will touch upon is:
- What SIP is all about
- SIP and sessions management
- Basic call flow
- Brief discussion of SIP messages
- SIP and audio
The presentation is a compiled assembly from the SIP RFC' s, and original works of Alan Johnston and Henry Sinnreich . It contains Sip Detailed , Call flows , Architecture descriptions , SIP services , sip security , sip programming.
SIP - More than meets the eye
Speakers:
Ofer Cohen - VOIP Group Leader, LivePerson
Yossi Maimon - VOIP Technical Leader, LivePerson
An Introduction to the SIP protocol.
SIP Position in telecommunication networks and the content services.
What is SIP:
The Session Initiation Protocol (SIP) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks.
The protocol defines the messages that are sent between peers which govern establishment, termination and other essential elements of a call. SIP can be used for creating, modifying and terminating sessions consisting of one or several media streams. SIP can be used for two-party (unicast) or multiparty (multicast) sessions. Other SIP applications include video conferencing, streaming multimedia distribution, instant messaging, presence information, file transfer, fax over IP and online games.
(Source: Wikipedia)
The Session Initiation Protocol (SIP) is the dominant signaling protocol used in VoIP today. It is
responsible for the establishment, control and termination of sessions by exchanging ASCII-text-based
messages between the endpoints. This post goes through the basic components of SIP: messages and
logical entities.
Brief introduction into SIP protocol, how it works, common problems to solve. Tech. details about handshake, SIP Trunks and SIP trunking. Market research.
If you don't know what SIP is, what it is used for or why you should even care then this is the section for you. This presentation will go over the very basics of SIP and assumes no previous knowledge of SIP or really any other network experience either. Topics it will touch upon is:
- What SIP is all about
- SIP and sessions management
- Basic call flow
- Brief discussion of SIP messages
- SIP and audio
The presentation is a compiled assembly from the SIP RFC' s, and original works of Alan Johnston and Henry Sinnreich . It contains Sip Detailed , Call flows , Architecture descriptions , SIP services , sip security , sip programming.
SIP - More than meets the eye
Speakers:
Ofer Cohen - VOIP Group Leader, LivePerson
Yossi Maimon - VOIP Technical Leader, LivePerson
An Introduction to the SIP protocol.
SIP Position in telecommunication networks and the content services.
What is SIP:
The Session Initiation Protocol (SIP) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks.
The protocol defines the messages that are sent between peers which govern establishment, termination and other essential elements of a call. SIP can be used for creating, modifying and terminating sessions consisting of one or several media streams. SIP can be used for two-party (unicast) or multiparty (multicast) sessions. Other SIP applications include video conferencing, streaming multimedia distribution, instant messaging, presence information, file transfer, fax over IP and online games.
(Source: Wikipedia)
This presentation contain basic knowledge about how voIP work and what are the security threat in voIP. It will also contain how we can prevent attack on voIP system.
Internet protocol (VoIP) is the technology of digitizing sound, compressing it, breaking it up into data packets, and sending it over an IP network.The conventional technique used for sending voice is PSTN (public switched telephone network) . As data traffic has higher speed than telephone traffic, so what we do most of the time we prefer to send voice over data networks. Voice over internet protocol (VoIP) is a method of telephone communication over a data network.
Presented by: Muhammad Yeasir Arafat
ElastixWorld 2013
Today, the session initiation protocol (SIP) is the predominant protocol for IP Telephony Signalling. The intention of this paper is to present an overview of IP Telephony security issues - both current and future – focusing on SIP. We start by presenting some fundamental differences between IP Telephony and the public switched telephone network (PSTN). We then look at specific problems for SIP signalling that arise from these differences. We summarize current activities regarding SIP security, including recent developments in the research community and standardization efforts within the IETF. Finally, the paper gives an outlook on the security issues of IP Telephony.
Download paper at: http://elx.ec/ssiipt
On remarque que le réseau 4G ne fournit pas le service téléphonique qui représente 60 % du chiffre d’affaires des opérateurs mobiles, car la LTE (EPS) ne traite pas la signalisation téléphonique. Son réseau fonctionne en mode paquet(PS) et il effectue uniquement le transport de paquets IP.
C’est la qu’intervient la Voix sur LTE qui est mise en oeuvre par l’association du réseau EPS pour le transport des flux (voix et signalisation téléphonique) et du réseau IMS (IP Multimedia Sub-system) pour le traitement de la signalisation téléphonique.
Le but de cet exposé est dans un premier temps d’étudier le réseau IMS afin de comprendre le call flow et par la suite tester ses fonctionnalités à travers une solution Open Source “Open IMS Core”.
I have described VoLTE IMS Architecture in simplified way . Are you also finding 3GPP Specs complicated & Complex for VoLTE IMS . It covers Role played by individual Networks Elements as mentioned below :-
# VoLTE SIP Handset : SIP Support , UAC , UAS , User Agent , SIP-UA
# Underlying LTE Network : MME , SGW , PGW , PCRF , HSS , Dedicated Bearer , QCI , Default Bearer
# IMS Core : SIP Servers , P-CSCF , I-CSCF , S-CSCF , TAS , MMTEL , BGw , MRF , ATCF , ATGW , IBCF , MGCF , IM-MGW , TrGW
# Voice Core or PSTN Network for Break-in or Break-out Calls
SIP (Session Initiation Protocol) is a signaling protocol used to create, manage and terminate sessions in an IP based network. This course is for beginners and aims to give a brief introduction to SIP before one ventures into the long RFC documents.
This presentation contain basic knowledge about how voIP work and what are the security threat in voIP. It will also contain how we can prevent attack on voIP system.
Internet protocol (VoIP) is the technology of digitizing sound, compressing it, breaking it up into data packets, and sending it over an IP network.The conventional technique used for sending voice is PSTN (public switched telephone network) . As data traffic has higher speed than telephone traffic, so what we do most of the time we prefer to send voice over data networks. Voice over internet protocol (VoIP) is a method of telephone communication over a data network.
Presented by: Muhammad Yeasir Arafat
ElastixWorld 2013
Today, the session initiation protocol (SIP) is the predominant protocol for IP Telephony Signalling. The intention of this paper is to present an overview of IP Telephony security issues - both current and future – focusing on SIP. We start by presenting some fundamental differences between IP Telephony and the public switched telephone network (PSTN). We then look at specific problems for SIP signalling that arise from these differences. We summarize current activities regarding SIP security, including recent developments in the research community and standardization efforts within the IETF. Finally, the paper gives an outlook on the security issues of IP Telephony.
Download paper at: http://elx.ec/ssiipt
On remarque que le réseau 4G ne fournit pas le service téléphonique qui représente 60 % du chiffre d’affaires des opérateurs mobiles, car la LTE (EPS) ne traite pas la signalisation téléphonique. Son réseau fonctionne en mode paquet(PS) et il effectue uniquement le transport de paquets IP.
C’est la qu’intervient la Voix sur LTE qui est mise en oeuvre par l’association du réseau EPS pour le transport des flux (voix et signalisation téléphonique) et du réseau IMS (IP Multimedia Sub-system) pour le traitement de la signalisation téléphonique.
Le but de cet exposé est dans un premier temps d’étudier le réseau IMS afin de comprendre le call flow et par la suite tester ses fonctionnalités à travers une solution Open Source “Open IMS Core”.
I have described VoLTE IMS Architecture in simplified way . Are you also finding 3GPP Specs complicated & Complex for VoLTE IMS . It covers Role played by individual Networks Elements as mentioned below :-
# VoLTE SIP Handset : SIP Support , UAC , UAS , User Agent , SIP-UA
# Underlying LTE Network : MME , SGW , PGW , PCRF , HSS , Dedicated Bearer , QCI , Default Bearer
# IMS Core : SIP Servers , P-CSCF , I-CSCF , S-CSCF , TAS , MMTEL , BGw , MRF , ATCF , ATGW , IBCF , MGCF , IM-MGW , TrGW
# Voice Core or PSTN Network for Break-in or Break-out Calls
SIP (Session Initiation Protocol) is a signaling protocol used to create, manage and terminate sessions in an IP based network. This course is for beginners and aims to give a brief introduction to SIP before one ventures into the long RFC documents.
Can IPv6 and SIP really work together well? At the SIP Network Operators Conference (SIPNOC) on April 24, 2013, Dan York moderated a panel on this specific question and gave an update on IPv6 deployment and interaction with VoIP.
With World IPv6 Launch happening June 6, 2012, production IPv6 network connectivity will be available to many more businesses and individuals. Major web sites and content providers will all enable IPv6 access to their content. Consumer electronics manufacturers are committing to providing IPv6-enabled devices.
What does this mean for SIP-based real-time communications? How well does SIP work with IPv6 today? What are the challenges to deployment and what steps can be taken to overcome those challenges? What should operators and vendors consider with regard to SIP and IPv6? What software, devices and tools are available to assist? And what case studies and other information is available?
In this session at SIPNOC 2012 on June 26, 2012, in Herndon, Virginia, Dan York discussed all of these points and provided concrete suggestions for moving forward with SIP and IPv6.
This is my Athcon 2013 slide set. I also demonstrated that attacking mobile applications via SIP Trust, scanning via SIP proxies and MITM fuzzing in Live Demo.
Sip Fundamentals and Prospects Tutorial - VoiceCon Orlando 2010Voxeo Corp
At VoiceCon Orlando 2010, Voxeo's Dan York taught a 3-hour tutorial about the Session Initiation Protocol (SIP) that was attended by over 200 people. The session explained the basics of SIP, walked through the message flow, discussed SIMPLE, SIP trunking and explored issues with distributed systems and federation.
http://blogs.voxeo.com/events/voicecon/
Please note that the slides were developed from a set of slides originally created by David Bryan of http://www.ethernot.org/ (used with his permission).
A short presentation on SIP Trunking. A background with SIP training and PSTN (T-1, ISDN PRI) and TCP/IP knowledge will be helpful. For more info connect with me at http://TrainingCity.com
AnyFirewall Engine is a software toolkit, based on STUN, TURN, and ICE, which enables guaranteed firewall and NAT traversal for fixed and mobile applications over any fixed or mobile network, through any NAT or firewall, and to any device.
AnyFirewall Engine is the world’s most widely deployed NAT and firewall traversal toolkit, having been deployed to more than 20 million subscribers by licensees including Comcast, Digital Lifeboat, Intel, Maxis, Nokia, Nokia Siemens Networks, Polycom, BlackBerry, Smartvue, and more.
AnyFirewall Engine can be deployed with AnyFirewall Server and AnyFirewall Gateway for an end-to-end firewall and NAT traversal solution, or can be combined with third-party, standards-based products.
Presentación de Tech Invite del los ejemplos SIP del capítulo 4 (overview of operation), detalladas en el capítulo 24 de RFC 3261 –
SIP: Session Initiation Protocol.
The Voice over Internet Protocol (VoIP). The VoIP is relatively new and is gaining more and more popularity as it offers a
wide range of features and is much more cost effective as compared to the traditional PSTN. But the VoIP brings with it certain
security threats which need to be resolved in order to make it a more reliable source of communication. Session Initiation Protocol
(SIP) today is considered the standard protocol for multimedia signaling, and the result is a very generic protocol. SIP is specified by
the IETF in RFC 3261. From a structural and functional perspective, SIP is application layer signaling text-based protocol used for
creating, modifying, and terminating multimedia communications sessions among Internet endpoints. Unfortunately, SIP-based
application services can suffer from various security threats as Denial of Service (DoS). attacks on a SIP based VoIP infrastructure that
can severely compromise its reliability. In contrast, little work is done to analyze the robustness and reliability of SIP severs under
DoS attacks. In this survey, we are discussing the DoS flooding attack on SIP server. Firstly, we present a brief overview about the SIP
protocol. Then, security attacks related to SIP protocol. After that, detection techniques of SIP flooding attack and various exploited
resources due to attack were discussed and finally the paper reviews previous work done on SIP based DoS attacks.
Over the past 10 years the Session Initiation Protocol (SIP) has moved from the toy of researchers and academics to the de-facto standard for telephony and multimedia services in mobile and fixed networks.
Probably one of the most emotionally fraught discussions in the context of SIP was whether Session Border Controllers (SBC) are good or evil.
SIP was designed with the vision of revolutionizing the way communication services are developed, deployed and operated. Following the end-to-end spirit of the Internet SIP was supposed to turn down the walled gardens of PSTN networks and free communication services from the grip of large telecom operators. By moving the intelligence to the end systems, developers were supposed to be able to develop new communication services that will innovate the way we communicate with each other.
This was to be achieved without having to wait for the approval of the various telecommunication standardization groups such as ETSI or the support of incumbent telecoms.
Session border controllers are usually implemented as SIP Back-to-Back User Agents (B2BUA) that are placed between a SIP user agent and a SIP proxy. The SBC then acts as the contact point for both the user agents and the proxy. Thereby the SBC actually breaks the end-to-end behavior of SIP, which has led various people to deem the SBC as an evil incarnation of the old telecom way of thinking. Regardless of this opposition, SBCs have become a central part of any SIP deployment.
In this paper we will first give a brief overview of how SIP works and continue with a description of what SBCs do and the different use cases for deploying SBCs.
In a hyperconnected economy, businesses need tools that empower employees to work together and get more done, anytime, anywhere, using the devices they prefer. SIP Trunking enhances mobility and presence, and provides end-to-end unified communications applications, among other advantages. This paper explains how companies can simplify company-wide business communications using SIP-to energize communications, productivity, collaboration, and business growth.
Analysis of VoIP Forensics with Digital Evidence Procedureijsrd.com
The invention of Voice over Internet Protocol (VoIP) in communication technology created significant attractive services for its users, it also brings new security threats. Criminals exploit these security threats to perform illegal activities such as VoIP malicious attacks, this will require digital forensic investigators to detect and provide digital evidence. Finding digital evidence in VoIP malicious attacks is the most difficult task, due to its associated features with converged network. In this paper, a Model of investigating VoIP malicious attacks is proposed for forensic analysis. VoIP spoofing is being a common and most important threat to the VoIP users. It is technically possible for an attacker to masquerade as another VoIP caller (VoIP spoofing). A design of a SIP which will try to capture all of the data on a VoIP network and process it for forensic analysis with also detection of the spoofing or the fake caller address.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
2. ABSTRACT
SIP provides for the seamless transmission of voice, fax, and data
across IP and traditional telephone networks.
The IETF defines SIP as “a text- based protocol, similar to HTTP
and SMTP, for initiating interactive communication sessions between
users. Such sessions include voice, video, chat, interactive games,
and virtual reality.”
The Session Initiation Protocol (SIP) is an Internet Engineering Task
Force (IETF) standard protocol for initiating an interactive user
session that involves multimedia elements such as video, voice, chat,
gaming, and virtual reality.
3. INTRODUCTION
SIP is a request-response protocol, dealing with requests from clients
and responses from servers. Participants are identified by SIP URLs.
Requests can be sent through any transport protocol, such as UDP,
SCTP, or TCP.
The protocol can also invite participants to unicast or
multicast sessions that do not necessarily involve the initiator.
Because the SIP supports name mapping and redirection services, it
makes it possible for users to initiate and receive communications
and services from any location, and for networks to identify the users
wherever they are.
4. APPLICATIONS
It has given rise to generation of new types of smart phone. With the
help of the technology now smart phones also support the video
conferencing.
setting up voice-over-IP calls
setting up multimedia conferences
event notification (subscribe/notify) à IM and presence
text and general messaging
signaling transport
5. FUNCTIONALITY
As the name implies the session initiation protocol is about initiation
interactive communications sessions between users. SIP also handles
termination and modifications of sessions as well.
Locating the user – supports personals mobility
Inviting the user for session
Delivering the session description
Terminate the session
7. WORKING PROCESS
User Agents:
User agent is an application which contains both a user agent client
and user agent server. A user agent client (UAC) is a client
application that initiates the SIP request. A user agent server (UAS)
is a server application that contacts the user when a SIP request is
received.
proxy server:
The Proxy Servers are application layer routers that forward SIP
request & responses.
8. Continution
Redirect server:
A redirect server is a server that accepts a SIP Requests & then return
the location of another SIP user agent & server where the user might
be found.
Registrar server:
A registrar is a server that accepts REGISTER requests. A registrarer
is typically co-located with a proxy or redirect server and offer
location services.
9. ADVANTAGES
SIP is scalable, easy to implement, and requires less setup time than
its predecessor protocols.
SIP can be used to modify any session in progress, a normal
telephone call session can be converted into a multi-party
videoconference.
Users can join in the session no matter what kind of terminal he is
using or where he is located. The other person may be logged on to
Internet through a PC, or may be traveling with a cell phone.
10. DISADVANTAGES
One SIP challenge is that SIP message contain information that
Client and/or server will like to keep private but SIP header as well
as message in the open and distributed architecture of VOIP systems
makes it difficult to keep this information confidential.
When a SIP user is registering with SIP Registrar server the attacker
can hijack the registration.
Two main reasons for this attack are: SIP messages being sent in
clear and no SIP message authentication built into the protocol
11. CONCLUSION
SIP is now a days used for internet conferences, internet
multimedia, internet telephony calls at distance learning with
compatible session like voice, chat , traditional telephony
networks, voice, fax, interactive games etc.
SIP become a standard IETF protocol for signaling in third –
generation mobile networking SIP runs on top of several
different transport protocols.