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SIP for Mobile Services

SIP for Mobile Services. Arjun Roychowdhury Hughes Software Systems. Agenda. Different Mobile Networks SIP in mobile networks (client and server side) SIP service models SIP and thin clients Presence & IM 3GPP update Conclusion. Different Mobile Networks.

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SIP for Mobile Services

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  1. SIP for Mobile Services Arjun Roychowdhury Hughes Software Systems

  2. Agenda • Different Mobile Networks • SIP in mobile networks (client and server side) • SIP service models • SIP and thin clients • Presence & IM • 3GPP update • Conclusion Internet Telephony, San Diego, 2002

  3. Different Mobile Networks • Remember: SIP for Mobile Networks is not ONLY SIP for 3GPP/3GPP2 ! • Existing 2/ 2.5 G/CDMA 1xRTT etc. are all mobile networks that benefit from services • SIP can be used to bridge all these networks together under a common service architecture • wLAN another big network for SIP based mobile services (paranet !) Internet Telephony, San Diego, 2002

  4. ‘Mobility’ in SIP parlance • 3 levels of mobility: • Terminal • best not handled by SIP -> typically at lower levels • Personal • handled by SIP -> registration, proxy, redirection • Service • This is where the business model lies ! Use your configured services irrespective of the device or location you are presently at. SIP helps in enabling this Internet Telephony, San Diego, 2002

  5. SIP in Mobile Networks • Server Side • Provides a combination of Centralized and Peer-Peer models for service realization • Integration with Web servers (via SIP servlets, SIP CGI etc) enable new ASP based service models • Client Side • Low footprint implementations ideal for Thin Client technology Internet Telephony, San Diego, 2002

  6. Why one protocol across segments ? • Common Service Architecture • Infrastructure Reuse • Quick time to market (corollary of above point) • Need is for a protocol that: • flexible to adopt to new network architectures • Not overtly complex to implement • Provides opportunities to introduce new service models wireless legacy SIP NGN wireline Internet Telephony, San Diego, 2002

  7. Understanding the SIP service model Service Invocation Peer - Peer Model. Each AS does a specific job. Communicating entity only interested in the result and not how Application Server Controller (ASC) SIP, HTTP, RTP SIP, HTTP, RTP SIP, HTTP, RTP Vendor domain 2 Vendor domain 1 Application Server (AS) Application Server (AS) Application Server (AS) SIP, HTTP, RTP SIP, HTTP, RTP Application Server (AS) Application Server (AS) Internet Telephony, San Diego, 2002

  8. Which is the right service model ? • Correct Model is a mix of MS and P-P • Questions to be asked: • Who makes money ? • Delays introduced by full distribution • Single Vendor/Multi Vendor Network ? Internet Telephony, San Diego, 2002

  9. Phones become PDAsPDAs become phonesPhones become MP3 players… and everything goes wireless Converged Devices SIP for Wireless Clients Handsets PDAs SIP fits in naturally in all these devices: • SIP for IP telephony • SIP for Appliances (Home Network) • SIP for gaming • SIP for data services (IM, presence etc)... Appliances PCs Internet Telephony, San Diego, 2002

  10. SIP and Thin Clients.. Salient Features of SIP critical for succeeding in strict boundaries of hand held devices: • Simple protocol translates to simpler processing requirements • A typical UE side SIP Stack can be made to be less than 50k • Affinity to HTTP style makes it a natural for Web Based services • Distributed service architecture allows for complete isolation of service request (on UE) and execution (on IMS nodes) • j2ME is gaining lot of acceptance- when mature, backend services based on JAIN-SIP/JSLEE and SIP servelets will be key enablers of services • And then there is ofcourse….. Internet Telephony, San Diego, 2002

  11. Presence & IM for Mobiles Services !! • Presence+IM is the next killer app for wireless devices • First lets define Presence: Its not just “online” and “offline” - often confused today with IM Presence is the dynamically changing set of means, willingness, capabilities, characteristics and ability for users to communicate and interact with each other Internet Telephony, San Diego, 2002

  12. NOTIFY SUBSCRIBE/OK REGISTER/OK REGISTER/OK Service Example - Auto Conferencing App. Server Conferencing Server Presence Server Lightweight Stimulus Signalling Internet Telephony, San Diego, 2002

  13. SIP in 3GPP update 3GPP r5 main concentration of IETF ‘IETF dependencies’ (Bundles 2, 2A, 3) RFC 3261 baselined Several ‘P-header’ drafts released http://www.3gpp.org/TB/Other/IETF.htm for details Internet Telephony, San Diego, 2002

  14. Conclusion • SIP is the natural way for wireless services • adopted by 3GPP • existing 2/2.5G networks looking at SIP-enabling MSCs • Unified presence architecture in place • SIP is lightweight to provide locally hosted services in handsets • Wide adoption of SIP across Wireline and Wireless networks Internet Telephony, San Diego, 2002

  15. Thankyou Arjun Roychowdhury aroychow@hss.hns.com Hughes Software Systems

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