Interconnects - SBC Tutorial


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Interconnects - SBC Tutorial

  1. 1. Interconnects – SBC Tutorial Larry Schessel Office of the CTO MSF Meeting, Berlin April, 2006
  2. 2. IP Interconnect vs VoIP Interconnect VoIP VoIP VoIP VoIP VoIP <ul><li>Service dependent </li></ul><ul><li>Call setup protocols – extensions for service </li></ul><ul><li>Levels of transparency based on business contract </li></ul><ul><li>Federated/syndicated interconnection </li></ul>IP IP IP IP IP <ul><li>Service independent </li></ul><ul><li>Standard routing protocols </li></ul><ul><li>Transparency is key </li></ul><ul><li>Two predominant types – public and private peering </li></ul>
  3. 3. Characteristics of VoIP <ul><li>Signaling and media may traverse different networks </li></ul><ul><li>Intermediate systems for signaling and media are different </li></ul><ul><li>Signaling and media networks may be independently secured </li></ul><ul><li>Signaling and media have different quality characteristics </li></ul><ul><ul><li>Media is latency, jitter and packet loss sensitive </li></ul></ul><ul><ul><li>Signaling quality measured by security </li></ul></ul>
  4. 4. Basic VoIP Interconnects Carrier Peering PSTN Orig/Term Media GW Enterprise IP Trunking IP PBX’s IP Phones Consumer Voice 2.5G or 3G/IMS Applications VoIP Network PSTN Mobile Broadband VoIP Network
  5. 5. Typical SBC Requirements <ul><li>SBC is point of … </li></ul><ul><li>Administrative demarcation </li></ul><ul><li>Security (DoS, DDoS) </li></ul><ul><li>Prevention of service abuse </li></ul><ul><li>Normalization </li></ul><ul><li>Accounting </li></ul><ul><li>Traffic segmentation </li></ul><ul><li>SLA enforcement </li></ul><ul><li>Quality of service </li></ul><ul><li>Network isolation and insulation </li></ul>
  6. 6. Basic Interconnect Example SBG-NE SBG-NE Media Applications Location Management CSC Core
  7. 7. Roaming Interconnect Example D-SBG-NE SBG-NC SBG-NE Media Applications Location Management Roaming P-CSC I-CSC Static CA
  8. 8. Wholesale/ASP Interconnect Example SBG-NE ASP SBC SBG-NE Media Applications Location Management Static CA Static CA
  9. 9. Which SBC performs … <ul><li>Security (DoS, DDoS)? </li></ul><ul><li>Prevention of service abuse? </li></ul><ul><li>Accounting? </li></ul><ul><li>Traffic segmentation? </li></ul><ul><li>SLA enforcement? </li></ul><ul><li>Quality of service? </li></ul>
  10. 10. IP Layer Poses Additional Considerations SBG-NE ASP SBC SBG-NE Media Applications Location Management Static CA Static CA Delay, packet loss, latency
  11. 11. Proliferation of Interconnects <ul><li>Number of interconnects does not scale </li></ul><ul><li>Business relationship proliferation </li></ul><ul><li>However, more demand for increased service reach </li></ul><ul><li>New Hub architecture for interconnects </li></ul><ul><ul><li>Promoted by mobile operators </li></ul></ul>WLAN VoIP Content Enterprise Fixed ASP Mobile
  12. 12. Interconnect Requirements Beyond SBCs <ul><ul><li>Flexibility </li></ul></ul><ul><ul><ul><li>Separation of media and signaling routing </li></ul></ul></ul><ul><ul><ul><li>“ Any-to-any” interworking – SIP, H.323, multiple vendor interoperability </li></ul></ul></ul><ul><ul><ul><li>“ On-demand” media processing and transcoding </li></ul></ul></ul><ul><ul><li>Enforceability </li></ul></ul><ul><ul><ul><li>Call admission control: l imits for total concurrent, ingress and egress calls </li></ul></ul></ul><ul><ul><ul><li>Session admission control: l imits for total, ingress, and egress bandwidth </li></ul></ul></ul><ul><ul><ul><li>Call/session accounting </li></ul></ul></ul><ul><ul><ul><li>Real-time statistics, processing, reporting and reaction </li></ul></ul></ul><ul><ul><li>Control </li></ul></ul><ul><ul><ul><li>Segmentation/classification of sessions </li></ul></ul></ul><ul><ul><ul><li>Session routing </li></ul></ul></ul><ul><ul><li>Manageability, scalability, reliability, etc. </li></ul></ul>
  13. 13. Conclusion: Interconnect Requires a Multi-Tier Architecture Layers Functions Product Layer 7 Session Management Layer 5 Signalling Sub-System Layer 3-4 Media Switch Sub-System Reporting Provisioning Policy Control Peering Policy Enforcement Session Control Media Routing Engine Media Processing Session Manager D-SBG S-SBG Security Interworking Analytics Engine Typical SBC Functionality Additional Interconnect Solution Functionality Adaptive Routing Engine Security
  14. 14. Conclusion <ul><li>Most current SBC requirements defined bottom-up and typical SBCs work well in basic single-service networks </li></ul><ul><li>However, session management requirements are changing as networks become more complex </li></ul><ul><li>Experience shows it is best for Service Providers to begin work from the service layer and work down (what interconnect service do they need to deliver?) </li></ul><ul><ul><li>Define interconnect requirements, then architecture, then components </li></ul></ul><ul><li>Interconnect service requires components to work as a system rather than point products – SBCs are just the tires on the car rather than the car itself </li></ul>
  15. 15. The Freedom of seamless connectivity over diverse IP networks Thank You.; +1-240-912-3327