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Asterisk for the Enterprise

Asterisk for the Enterprise. An Open Source answer. Contents. Introduction Asterisk fundamentals Redundancy and failover Routing issues ENUM and DUNDi Importance of peering In short. Introduction. VoIP the Open Source way since 2001 Providing services to end users since 2003

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Asterisk for the Enterprise

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  1. Asterisk for the Enterprise An Open Source answer Florian Overkamp / SpeakUp

  2. Contents • Introduction • Asterisk fundamentals • Redundancy and failover • Routing issues • ENUM and DUNDi • Importance of peering • In short Florian Overkamp / SpeakUp

  3. Introduction • VoIP the Open Source way since 2001 • Providing services to end users since 2003 • Active in R&D • Operating our own platform Florian Overkamp / SpeakUp

  4. Asterisk fundamentals • “Asterisk is a complete PBX in software. It runs on Linux, BSD and MacOSX and provides all of the features you would expect from a PBX and more. Asterisk does voice over IP in many protocols, and can interoperate with almost all standards-based telephony equipment using relatively inexpensive hardware.“(www.asterisk.org) Florian Overkamp / SpeakUp

  5. Asterisk fundamentals (2) • PBX and IVR and Voicemail server and… • Supports SIP, MGCP, H323, IAX2 and even SCCP (Cisco) • Many PSTN connection types (ISDN2, ISDN30 etc) through PCI boards • Functions with PBX and gateway separate or all in one • Support for CTI applications (TAPI) and Call center functionality Florian Overkamp / SpeakUp

  6. Redundancy and failover • A few approaches • Putting a SIP proxy in front (SIP only) • Dialing failover (if the first fails, try the next) • DUNDi (covered later) • High availability setup (IP takeover) Florian Overkamp / SpeakUp

  7. A failover network (‘simplified’) Florian Overkamp / SpeakUp

  8. Routing issues • Asterisk can route to different machines by prefix • Can be used for LCR (carrier select) • Can also be used to call to other asterisk services (branch offices) • With large setups this can be too rigid and hard to maintain Florian Overkamp / SpeakUp

  9. ENUM and DUNDi • Peering strategies to make discovery of remote extensions easier • ENUM covered enough today, suffice to say it is supported in Asterisk. You decide what DNS tree to use • Distributed Universal Number Discovery (DUNDi) is a good alternative • Limited support outside Asterisk • Designed as a peer-to-peer system: no single control point Florian Overkamp / SpeakUp

  10. DUNDi principles • Russell: “I need to reach 31534305842, any idea how to do that ?” • Sara: “I'm not sure. Hey Andy, do you know where Russell can reach 31534305842?” • Andy: “Not off the top of my head. Hey Beth, do you know where Russell can reach 31534305842?” • Beth: “Yah, you can reach them through their server at sip:31534305842@continental.speakup.nl.” • Andy: “Beth says its at sip:31534305842@dundi.speakup.nl.” • Sara: “Beth says its at sip:31534305842@dundi.speakup.nl.” • Russell: “Thanks!”--------------------------------------------------------------------- • Tom: “I need to reach 31534305842, any idea how to do that ?” • Sara: “Beth just said its at sip:31534305842@continental.speakup.nl.” • Tom: “Thanks!” Florian Overkamp / SpeakUp

  11. DUNDi principles (2) Florian Overkamp / SpeakUp

  12. Comparison • ENUM based on a DNS tree, caching is done in local DNS • DUNDi is peer-to-peer, with caching • DUNDi offers an authentication model to avoid SPIT etc. • GPA allows peering without pollution of the ‘directory’ or invalid CallerID Florian Overkamp / SpeakUp

  13. Importance of peering • Available technology - Telco’s need to participate as a service to customers who will otherwise do it themselves • Be aware of security considerations • As more destinations become VoIP-reachable the market opens for more/smaller VoIP Telco's • Popularity for interconnecting on VoIP will grow • As a result the trend towards flat-rate pricing models will increase • Telco’s and service providers will (need to) focus on added value services Florian Overkamp / SpeakUp

  14. In short • Asterisk (and related projects) offer an Open Source alternative that can compete with commercial solutions • VoIP peering is an important step in the path to full PSTN migration • It will change the economical models • Security / privacy considerations need to be addressed • DUNDi addresses some of these considerations • It can be made to interconnect with ENUM and other platforms (technically) Florian Overkamp / SpeakUp

  15. Thank you for your attention http://www.asterisk.org/ http://www.dundi.com/ http://www.speakup.nl/ Florian Overkamp / SpeakUp

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