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Instant Messaging Architectures and Concepts

INFOTECH Seminar Advanced Communication Services Mentor: Dr. Stephan Rupp. Instant Messaging Architectures and Concepts. Linan Zheng 07.07.2005 Institute of Communication Networks and Computer Engineering University of Stuttgart. Motivation. Linan's happy life with MSN. Agenda.

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Instant Messaging Architectures and Concepts

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  1. INFOTECH Seminar Advanced Communication Services Mentor: Dr. Stephan Rupp Instant Messaging Architectures and Concepts Linan Zheng 07.07.2005 Institute of Communication Networks and Computer Engineering University of Stuttgart

  2. Motivation Linan's happy life with MSN

  3. Agenda • Introduction • What is IM system? • Presence awareness • Jabber • What is Jabber? • Architecture • Protocol • Client/Server interaction • Other popular IM system • Features • Comparison • Conclusion

  4. Concepts and Development of IM • An Internet-based protocol application • Real-time communication • Business opportunity • Two directions: • Integrated services: data transmission voice chatting, video conference, e-mail ,etc • more flexible mobility

  5. Presence Awareness • Presence indicates the state that a user or application is in Such as online, sleeping, dating, on vacation, meeting, at office… • Let other peers know: are you available to have a conversation or other kind communication • Can convey place, current event, activity or any other state you wish to share

  6. Agenda • Introduction • What is IM system? • Presence awareness • Jabber • What is Jabber? • Architecture • Protocol • Client/Server interaction • Other popular IM system • Features • Comparison • Conclusion

  7. What is Jabber? • An open-source XML-based messaging platform • Uses a worldwide distributed network, utilizing many interconnected servers • Decentralized: Anyone can run their own Jabber servers • Security: Any server can be isolated with public Jabber network • Initially designed as a universal instant messaging platform by gateways, to connect users ofAOL, MSN, ICQ and other IM systems to each other

  8. Jabber Architecture • Client/Server, modelled closely after the internet mail system • Server handles user authentication and stores information about users, including the contact list • A Jabber user id closely resembles an email address: Alice@Jabber.org • Server contains a component called Etherx, translation between different servers and messaging systems

  9. Jabber Protocol • XMPP (eXtensible Messaging & Presence Protocol ) • An XML-based protocol for delivering instant messages and presence information in near-real-time between presence-aware entities in a Jabber network • Include security, authentication, privacy, and access control, localization and internationalization (RFC2778, RFC2779) • Only three basic Stanzas: • message (client-to-client conversations) • iq (query messages) • presence (used to update a client’s availability)

  10. Client/Server Interaction • Connecting • Authentication/ Login • Inform Presence • Sending and Receiving Messages • Ending Session

  11. Roster and Subscription • Roster(contact list) • Storeontheserver so thattheclient can accessit • Main opperations: • Retrieve roster information •Add a new item •Delete an existing item •Update roster information • Subscriptions • An agreementtoforwardpresence changestothesubscriber • Categories: •To – sends your presence info to another entity • From – receives presence info from another entity • Both – both sends and receives presence info • None – neither send or receive presence info

  12. Agenda • Introduction • What is IM system? • Presence awareness • Jabber • What is Jabber? • Architecture • Protocol • Client/Server interaction • Other popular IM system • Features • Comparison • Conclusion

  13. ICQ • “I seek you” -one of the first IM, still popular • Great functionalities • Operates in a server-based, peer to peer fashion • Two main types of communication: Client/Server and Client/Client

  14. MSN Messenger • The most popular instant messaging service • Tight integration between Hotmail, .NET Passport and MSN accounts • Three kinds of servers: Dispatch Server (DS), Switchboard Server (SS), Notification Server (NS)

  15. Comparison

  16. Comparison

  17. Agenda • Introduction • What is IM system? • Presence awareness • Jabber • What is Jabber? • Architecture • Protocol • Client/Server interaction • Other popular IM system • Features • Comparison • Conclusion

  18. Conclusion • Advantage and Disadvantage of IM Key success factor – • Combining instant message delivery and presence information Existing Problems – • Security: Eavesdropping, Account Hijacking, Password protection, Data Access and Modification • Efficiency: Disturb and waste time during work • The attractive characteristic of Jabber is its open source protocol • Market leaders have more attractive and practical functionalities • Free, open, public, scalableand easily understandable • IM goes into Mobile! • Combine with wireless network, mobile phone and IP technology

  19. Thanks for your attention!

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