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Instant Messaging and Presence with SIP

Instant Messaging and Presence with SIP. Sharmistha Chatterjee 82349D Helsinki University of Technology. Topics. Origin Features Subscribe/Notify Presence Server Message format Modes Provisioning Problems Security Implementations Conclusions. Origin

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Instant Messaging and Presence with SIP

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  1. Instant Messaging and Presence with SIP Sharmistha Chatterjee 82349D Helsinki University of Technology

  2. Topics • Origin • Features • Subscribe/Notify • Presence Server • Message format • Modes • Provisioning • Problems • Security • Implementations • Conclusions

  3. Origin Originated from SIP (Session Initiation Protocol). Internet Engineering Task Force’s SIMPLE working group formalized a set of backwards compatible extensions to SIP. This standard came to be known as SIMPLE(SIP Instant Messaging and Presence Leveraging Extensions). SIMPLE

  4. Features of SIMPLE • SIMPLE ,extension of SIP is backward compatible. • Presence data is centrally managed by the server by implementing SUBSCRIBE/NOTIFY. • SIMPLE is used extensively in CRM applications for corporate Communications. • Supports Instant Messaging during online gaming sessions. • Supports Instant Messaging and Presence in mobile systems. • Presence information enables automatic alerts and notifications to database queries via an instant messaging interface.

  5. SIMPLE SUBSCRIBE/NOTIFY • User agent subscribes to a presence server for a limited period of time. • Receives notifications from the presence server. • Watcher Information Event generated allows authorization decision on requests.

  6. SIMPLE PRESENCE SERVER

  7. SIMPLE Message Format • SIMPLE implements Presence Information Data Format (PIDF). • CIPID: Contact Information in Presence Information Data Format contains display-name,icon,map,sound. • User Agent Capability : SIP user agent reports technical capabilities of the device. • RPID: The Rich Presence Information Data format represents user mood and activity, physical properties such as location and environment

  8. SIMPLE Message Format • Place-is • Place-type • Privacy • Mood • Relationship • Activities • User-input • Partial Presence (PIDF-diff): Maintains recent information updates through versioning. • Timed Presence :Availability of the user. • Location data: Facilitates location-based services.

  9. Different modes of SIMPLE • Page mode - Contains the contents of the instant message.Efficient for short messages. • Session mode - Supports conferencing,long conversations.

  10. SIMPLE Provisioning • Dynamic means of data management by XML Configuration Access Protocol (XCAP). • Uses HTTP. • Manages Buddy lists, privacy policies and offline presence status. • Preserves entire list of changes through history of Etags.

  11. Federation • Exchange of IM within a single domain(intra domain) or across multiple domains(inter domains). • Main drawback of scaling. • Huge amount of notification traffic. • View sharing reduces subscription overhead.

  12. SIMPLE Problems • Messages load : Low Bandwidth and high latency. • State management : Huge complex state processing of all watchers. • Processing complexities : Frequent operations on all messages. • Groups : Ease of subsription creates large groups. • Stopping notifications : No method that a watcher could stop receiving notifications

  13. Privacy and Security • XCAP and the presence server takes the role of providing privacy filtering. • User Agent signs SIP message bodies using own certificates. • SIP Identity header ensures notifications are not forged. • Foreign domain presence server communicates over a secure TLS channel. • S/MIME (Secure/Multipurpose Internet Mail Extensions) provides a consistent way to send and receive secure MIME data using RSA. • Presence server maintains ACL(Access Control Lists).

  14. Implementations • Agile Mobile SIP/SIMPLE Client – Supports XCAP,multimedia instant messaging,group chat,presence management and contact list management. • The SIP Communicator – Allows block or ignore, contacts. • SIMPLE Remote Monitoring System – A user can remotely monitor presence at his home

  15. Conclusions • SIMPLE using the framework of SIP serves a perfect building block for advanced communication systems in mobile environment. • AOL introduced capabilities of tracking users having Wifi-----SIMPLE holds a promising future in next generation Instant Messaging. • Better performance than XMPP.

  16. References • Agile Mobile. http://www.agilemobile.com/simple.html. • SIP Communicator. http://sip-communicator.org/. • Day, M., Rosenberg, J., and H. Sugano.,. A Model for Presence and Instant Messaging.,. RFC 2778, The Internet Engineering Task Force, February 2000. http://ietf.org/rfc/rfc2778.txt. • Rosenberg. Optimizing Federated Presence with View Sharing. Internet-draft, The Internet Engineering Task Force, July 2008.http://www.ietf.org/internet-drafts/draft-ietf-simple-view-sharing-01.txt. • Rosenberg. Models for Intra-Domain Presence and Instant Messaging (IM) Federation. Internet-draft, The Internet Engineering Task Force, July 2008.http://www.ietf.org/internet-drafts/draft-ietf-simple-intradomain-federation-01.txt. • Schulzrinne, H.,. CIPID: Contact Information in Presence Information Data Format., draft-ietf-simple-cipid-04 . Rfc, The Internet Engineering Task Force, October 2005. http://tools.ietf.org/html/draft-ietf-simple-cipid-04.

  17. Thank You Questions?

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