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The eXtensible Peer Protocol (XPP)

The eXtensible Peer Protocol (XPP). Emil Ivov - emcho@sip-communicator.org Enrico Marocco – enrico.marocco@tilab.com. Table of Contents. Design Choices XPP Session Establishment XPP Operations Fragmentation and Reliability Message Formats XPP-PCAN Overview. Design Choices.

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The eXtensible Peer Protocol (XPP)

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  1. The eXtensible Peer Protocol (XPP) Emil Ivov - emcho@sip-communicator.org EnricoMarocco – enrico.marocco@tilab.com

  2. Table of Contents • Design Choices • XPP Session Establishment • XPP Operations • Fragmentation and Reliability • Message Formats • XPP-PCAN Overview eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  3. Design Choices • XPP uses UDP (only) • Simple & Reliable NAT Traversal • Allows turning off reliability • Small and simple header with TLV options • Sessions • Sessions are established and ended with SIP • Where is the DHT? eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  4. Use CasesSimultaneous Session Establishment SIP Alice Bob Alice’s SIP INVITE:INVITE sip:bob@biloxi.com SIP/2.0 To: Bob <sip:bob@biloxi.com> From: Alice <sip:alice@atlanta.com>;tag=1928301774 … c=IN IP4 130.79.90.54 m=application 1234 UDP/XPP * a=ltag: 0xAAAA … SIP INVITE SIP OK XPP SYN SYN Bob’s SIP OK:SIP/2.0 200 OK To: Bob <sip:bob@biloxi.com>;tag=a6c85cf From: Alice <sip:alice@atlanta.com>;tag=1928301774… … c=IN IP4 103.97.9.45 m=application 4321 UDP/XPP * a=ltag: 0xBBBB … ACK ACK XPP Session eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  5. Use CasesA Sample XPP Operation Alice Bob XPP Operation Request ACK XPP Operation Response Retrans.Timer XPP Operation Response ACK eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  6. Use CasesXPP Message Fragmentation Alice Bob XPP Operation Request; Fragment 1 ACK 1 XPP Operation Request; Fragment 2 ACK 2 XPP Operation Request; Fragment 3 Retrans.Timer XPP Operation Request; Fragment 3 ACK … XPP Operation Request; Fragment N ACK eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  7. XPP Fragment Header 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |S|A|R|L|K| | | Ver | Reserved |Y|C|E|F|P| Sequence Number | | | |N|K|L|R|A| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local ID | Remote ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | XPP Message Fragment (Optional) ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  8. XPP Messages 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |S|A|R|L|K| | | Ver | Reserved |Y|C|E|F|P| SequenceNumber | | | |N|K|L|R|A| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local ID | Remote ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Operation Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Operation Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Parameters ... +-+-+-+-+-+-+-+-+-+-+-+- eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  9. XPP TLV Options 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | |S|A|R|L|K| | | Ver | Reserved |Y|C|E|F|P| SequenceNumber | | | |N|K|L|R|A| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local ID | Remote ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Operation Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Operation Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Value ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  10. XPP-PCAN’s Passive Approach XPP Overlay • A P2PSIP client registers with the overlay just as it would register with any other SIP registrar XPP Sessions SIP REGISTER Client eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  11. XPP-PCAN’s Passive Approach XPP Overlay • A P2PSIP client registers with the overlay just as it would register with any other SIP registrar • During the initial registration the P2PSIP client asserts its identity against the credentials stored in the overlay. Once this phase completed, the client starts maintaining a SIP Outbound connection with a peer in the overlay. XPP Sessions SIP Outbound Connection Client eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  12. XPP-PCAN’s Passive Approach XPP Overlay • A P2PSIP client registers with the overlay just as it would register with any other SIP registrar • During the initial registration the P2PSIP client asserts its identity against the credentials stored in the overlay. Once this phase completed, the client starts maintaining a SIP Outbound connection with a peer in the overlay. • At some point of time an existing peer may decide to invite it to join the overlay and establish an XPP session with it. XPP Sessions XPP Session SIP INVITE Client eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  13. XPP-PCAN’s Passive Approach XPP Overlay • A P2PSIP client registers with the overlay just as it would register with any other SIP registrar • During the initial registration the P2PSIP client asserts its identity against the credentials stored in the overlay. Once this phase completed, the client starts maintaining a SIP Outbound connection with a peer in the overlay. • At some point of time an existing peer may decide to invite it to join the overlay and establish an XPP session with it. • The inviting peer would also advertise the arrival of the new peer to all its future neighbors. XPP Sessions XPP UPDATE XPP UPDATE XPP Session Client Peer eXtensible Peer Protocol (XPP) Emil Ivov, Enrico Marocco

  14. The eXtensible Peer Protocol (XPP) Emil Ivov - emcho@sip-communicator.org EnricoMarocco – enrico.marocco@tilab.com

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