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

2. | E. Marocco, G. Canal The World is Converging Mobile 802.11 GSM GPRS 802.16UMTS

3. | E. Marocco, G. Canal 802.11 GSM GPRS 802.16UMTS But Mobile is becoming Ephemeral Toothing Communities Municipal Free Wireless Networks Ad-Hoc Networks

4. | E. Marocco, G. Canal 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. | E. Marocco, G. Canal 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)  “Peer-to-Peer”  Distribution of location and routing services for communication  Distribution of storage service for file-sharing

6. | E. Marocco, G. Canal Who Cares?  Telcos?  Vendors?  Academics  Open Source  Users! IGNORE?

7. | E. Marocco, G. Canal 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 Cons  Scarce security  No identity assertion  No protection against malicious peers  Scarce connectivity  Hard to go over locality  No Services

8. | E. Marocco, G. Canal 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. | E. Marocco, G. Canal 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 Internet “full” IP HTTP SMTP POP3

10. | E. Marocco, G. Canal Municipal Free Wireless Applications  Exploiting “global” connectivity  Email  Web browsing  Exploiting “local” connectivity  File sharing  VoIP Internet “full” IP HTTP SMTP POP3

11. | E. Marocco, G. Canal 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. | E. Marocco, G. Canal P2PSIP: How It Works P2PSIP Overlay rome.test.net INVITE bob@rome.test.net REGISTER bob@rome.test.net alice@rome.test.netbob@rome.test.net

13. | E. Marocco, G. Canal P2PSIP: What Is Missing rome.test.netparis.test.org REGISTER bob@paris.test.org INVITE bob@rome.test.net alice@rome.test.net bob@rome.test.netbob@paris.test.net

14. | E. Marocco, G. Canal P2PSIP: Providing Interworking rome.test.netparis.test.org REGISTER bob@isp.test.com isp.test.com INVITE bob@isp.test.com alice@rome.test.net bob@isp.test.com

15. | E. Marocco, G. Canal P2PSIP: Actors Clients Peers Super Peers Relay Agents Proxies

16. | E. Marocco, G. Canal P2PSIP: Architecture p2psip.org SIP location DNS location

17. | E. Marocco, G. Canal P2PSIP: New Elements 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

18. | E. Marocco, G. Canal P2PSIP: Interworking 1/2 p2psip.org sip:alice@p2psip.org sip:example.com sip:bob@example.com Get Proxy Get Relay INVITE Media RFC3263 ICE

19. | E. Marocco, G. Canal P2PSIP: Interworking 2/2 p2psip.org sip:alice@p2psip.org sip:example.com sip:bob@example.com Get Proxy Get Relay Media RFC3263 INVITE

20. | E. Marocco, G. Canal P2PSIP: Providing More Than Transport YES  Identity  Gateways  Presence service  Conferencing  Voice mail MAYBE  Emergency calls  Legal interception No  QoS

21. | E. Marocco, G. Canal 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. | E. Marocco, G. Canal Some Pointers  Municipal Free Wireless Networks  MuniWireless Web Portal (http://www.muniwireless.com/)http://www.muniwireless.com/  Earthlink Municipal Networks Web Page (http://www.emnwifi.net/)http://www.emnwifi.net/  P2PSIP  P2PSIP Project Page (http://p2psip.org)http://p2psip.org  Concept and terminology (draft-willis-p2psip-concepts)  SIP-P2PSIP Interworking (draft-marocco-p2psip-interwork)  IMS  ;-)

23. | E. Marocco, G. Canal Thank You! Enrico Marocco enrico.marocco@telecomitalia.it http://sipdht.sourceforge.net