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Lucent, 2006, 26 th October

Lucent, 2006, 26 th October. P2PSIP: Interworking Enrico Marocco Research Engineer enrico.marocco@telecomitalia.it. UMTS. 802.16. SIP. 802.11. GSM GPRS. IMS. The World is Converging Mobile. Toothing Communities. Ad-Hoc Networks. Municipal Free Wireless Networks. SIP. UMTS.

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Lucent, 2006, 26 th October

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  1. Lucent, 2006, 26th October P2PSIP: Interworking Enrico Marocco Research Engineer enrico.marocco@telecomitalia.it

  2. UMTS 802.16 SIP 802.11 GSM GPRS IMS The World is Converging Mobile

  3. Toothing Communities Ad-Hoc Networks Municipal Free Wireless Networks SIP UMTS 802.16 GSM GPRS 802.11 IMS But Mobile is becoming Ephemeral

  4. Limited or Ephemeral Network Environments • Characterized by physical constraints (e.g. space, time, number...) • Limited diffusion • Limited requirements (e.g. security, equipment...) • Highly specialized (e.g. messaging, gaming, ad-hoc applications...) • Almost isolated (or partially connected) • Collaborative • Self-Sustained Cyber-Communities

  5. “Peer-to-Peer” Distribution of location and routing services for communication Distribution of storage service for file-sharing Technology in Limited or Ephemeral Environments • Unstable links • Cannot rely upon stable servers • Need of distributed fault tolerance (vs. single point of failure) • Missing or unconfigurable naming service • Cannot deploy stable servers • Need of multiple access points for resources (vs. centralization)

  6. Who Cares? • Telcos? • Vendors? • Academics • Open Source • Users! IGNORE?

  7. Cons Scarce security No identity assertion No protection against malicious peers Scarce connectivity Hard to go over locality No Services Peer-to-Peer Limited or Ephemeral Networks Pros • Ease of deployment • Need common devices • Click 'n go • Costless • Need cheap devices • No O&M • Increase of adoption • AUTOCONF, MANET • Just Applications

  8. What can Operators do? • Ignore it • In ephemeral environments service provisioning is not feasible • Internet-like applications are out of core business • Fill the gaps • Provide access-level service for upgrading reachability • Provide “some” services to applications • Impede • Filter P2P traffic whenever is possible • Force the use of IMS

  9. Internet HTTP SMTP POP3 “full” IP A Notable Example Municipal Free Wireless • Mesh of APs on street lamps • Full local connectivity • Cheap – Sustainable • 10-50 Mb/sec • Restricted Internet connection • Must serve Ms of users • Cannot support bandwidth-eager applications

  10. Internet HTTP SMTP POP3 “full” IP Municipal Free Wireless Applications • Exploiting “global” connectivity • Email • Web browsing • Exploiting “local” connectivity • File sharing • VoIP

  11. Municipal Free Wireless - VoIP • Cannot access the home network for call routing • Restricted connectivity • Cannot rely on central servers • Link weakness • Unaccessible configuration • Must rely on resources shared by users

  12. P2PSIP Overlay rome.test.net INVITE bob@rome.test.net REGISTER bob@rome.test.net alice@rome.test.net bob@rome.test.net P2PSIP: How It Works

  13. rome.test.net paris.test.org REGISTER bob@paris.test.org INVITE bob@rome.test.net alice@rome.test.net bob@rome.test.net bob@paris.test.net P2PSIP: What Is Missing ?

  14. rome.test.net paris.test.org REGISTER bob@isp.test.com INVITE bob@isp.test.com alice@rome.test.net bob@isp.test.com P2PSIP: Providing Interworking isp.test.com

  15. Clients Proxies Peers Super Peers Relay Agents P2PSIP: Actors

  16. DNS p2psip.org P2PSIP: Architecture location SIP location location SIP location

  17. Proxy Access to the Internet E.g. peers with DSL access Registered in the DNS with the overlay identifier Semi-stable Open issue: how to register? Client/Peer Must be able to route messages Media Relay Access to the Internet E.g. host with DSL access Must implement a relay mechanism TURN, TEREDO P2PSIP: New Elements

  18. sip:example.com p2psip.org Get Proxy Get Relay INVITE Media sip:bob@example.com sip:alice@p2psip.org P2PSIP: Interworking 1/2 RFC3263 ICE

  19. sip:example.com p2psip.org Get Proxy INVITE Get Relay Media sip:bob@example.com sip:alice@p2psip.org P2PSIP: Interworking 2/2 RFC3263

  20. MAYBE Emergency calls Legal interception P2PSIP: Providing More Than Transport No • QoS YES • Identity • Gateways • Presence service • Conferencing • Voice mail

  21. Do Not Repeat The Same Old Mistakes • Do not understimate • This applies to municipal and building networks, but could also extend to big Internet communities (Skype-like) • Go for a standard P2P solution • Remember the lesson learned from IM&P (ICQ + AIM + MSN + Yahoo!) • Keep it open • IMS is SIP based; let it also be SIP compliant • It is not services vs. applications • Voice is both a service and an application

  22. Some Pointers • Municipal Free Wireless Networks • MuniWireless Web Portal (http://www.muniwireless.com/) • Earthlink Municipal Networks Web Page (http://www.emnwifi.net/) • P2PSIP • P2PSIP Project Page (http://p2psip.org) • Concept and terminology (draft-willis-p2psip-concepts) • SIP-P2PSIP Interworking (draft-marocco-p2psip-interwork) • IMS • ;-)

  23. Thank You! Enrico Marocco enrico.marocco@telecomitalia.it http://sipdht.sourceforge.net

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