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SIP Thor Cost-effective, highly scalable SIP core network

SIP Thor Cost-effective, highly scalable SIP core network. by Adrian Georgescu Orange Labs, San Francisco July 1st, 2010. Introduction. My name is Adrian Georgescu Founder and CEO of AG Projects My business is the delivery of SIP infrastructure to operators

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SIP Thor Cost-effective, highly scalable SIP core network

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  1. SIP ThorCost-effective, highly scalable SIP core network by Adrian Georgescu Orange Labs, San Francisco July 1st, 2010

  2. Introduction • My name is Adrian Georgescu • Founder and CEO of AG Projects • My business is the delivery of SIP infrastructure to operators • We provide simple solutions for the complex problems of our customers • 8 years in the SIP business

  3. My open source portfolio • OpenSIPS – SIP Proxy/Registrar • OpenXCAP – Presence Policy Server • MediaProxy – RTP media Relay • MSRP Relay – IM media relay • CDRTool – Mediation and Accounting • Blink – State of the art SIP client

  4. My story today • Replacing IMS core with self organizing SIP networks based on P2P • How to roll out a cost-effective country level infrastructure • Lowering down the operational costs to ‘almost zero’

  5. The danger of 99.9 %

  6. An American company instructed their new Japanese supplier that the parts they have ordered should conform to US firm’s exacting quality standards - 99. 9% conformity with specification Confused, but determined to comply, the Japanese firm deliberately shipped one faulty component with every 999 perfect ones. A note accompanied the shipment stating that they were unsure why the customer wanted 0.1 per cent failure but they were happy to oblige. From the book How to Move Minds and Influence People by Iain Carruthers

  7. Short history of PSTN • PSTN is a centralized network where various elements are chained to provide one service: Voice • The business model followed a “create and manage bottleneck” architecture inherited from the way the network was built (incremental) • The need for cost effective growth and the possibility of introducing new services brought NGN into the picture

  8. Motivation for migration to NGN • Lower the operational expenditure by converging the data and voice networks into one single network (operational cost reduction) • Increase the revenues by introducing new services beyond traditional voice services (roll-out new services)

  9. The Next Generation Networks (NGN) • NGN is a model proposed by ITU-T that aims to implement a a model similar to PSTN by using the Internet protocols • Network is application aware • Call Control functions reside in the network • QoS is a matter of central control (to guarantee the 5 times 9)

  10. ITU-T NGN architecture Picture provided by Richard Stastny

  11. IMS, NGN solution for mobile networks • IMS initially developed by 3GPP to replace the mobile networks • Based on operator controlled, walled-garden Internet • Based on the SIP protocol developed within IETF • Internet protocols have been chosen for their efficiency while trying to maintain a closed network

  12. 3GPP IMS architecture Picture contributed by Gonzalo Camarillo

  13. IMS, NGN solution for fixed networks • IMS was designed to implement an all-IP telecommunications environment for the fixed line operators too • IMS supported also by ETSI (TISPAN) with its extensions for the fixed line networks (DSL/cable) • Based again on an operator controlled, walled-garden Internet

  14. ETSI TISPAN IMS Architecture Picture provided by Richard Stastny Rf /Ro Ut Rf /Ro Charging Ut Application Servers Functions Sh Rf /Ro ISC Dh UPSF Iw SLF Cx IWF Dx Ib P3 IMS / PSTN Simulation PSTN Emulation (R2) Mw Mw/Mk/Mm IBCF Ic I/S - CSCF Mk Mi AGCF P2 Mk BGCF Mw Mr Mj Gq ' Mg e2 SGF P - CSCF MGCF MRFC Ie Other IP Networks P1 Gq ' Gq ' Network Gm SPDF PSTN/ISDN SPDF Attachment Resource & Admission Control Resource & Admission Control Mp Mn Subsystem A-RACF e4 MG Re Ia MRFP T - MGF I - BGF UE BGF RCEF IP Transport (Access and Core) CNG -

  15. IMS is clogged with technical problems • Follows a classic telephony design with chained components, enforcing resource scarcity • End-to-end communication not possible between end-points • Innovation possible and allowed only in the network core • Complexity. 12 components with 22 interfaces (release 4), +30 interfaces in release 6

  16. Why is IMS so complex? • Decomposing devices into most granular functions and links • Tracking and controlling end-user behavior for billing purposes • The proliferation of boxes and protocols for the state management required for data tracking leads to cognitive overload but adds little value. • Complexity is ugly

  17. IMS deployment cost is prohibitive • Cost of deployment • Cost of maintenance, many components, boxes, links • Development costs, services deployed only from the core • Delivers for a huge cost less than your consumers got from Skype yesterday

  18. The cost of walled gardens • Telecom industry is definitely not known for its innovations • Raising barriers cost money and returns nothing back • By the time you finish raising up your walled garden, the customers are safely outside • All innovation today is taking place on the public Internet

  19. Internet is simple and simple is beautiful • Internet is a simple network • Internet services (called applications) are performed at the edge • More CPU power on the edge, more applications available • Increase of bandwidth eliminates the source of QoS problems • Based on the end-to-end principle Picture contributed by unknown lady

  20. the end-to-end principle of the Internet • Network is unaware of the applications, this makes it scalable • Nothing should be done in the network that can be done in an end-system • Quality of Service (QoS) is a matter of bandwidth availability and not of central control (RTT and packet loss)

  21. Why do Internet business models flourish? • Services are available on the edge, spread virally • Internet is an “eat all you can” model with easy to bill flat-fee models • New applications are rolled out faster at the edge • Free services attract naturally large amount of users to premium services

  22. Real-time communications over the Internet • SIP - Signaling protocol to setup and terminate sessions • ENUM - Translate telephone numbers into SIP addresses • Presence - enable applications beyond voice • RTP media for audio, video • MSRP media for IM and File Transfer

  23. P2P, scalable Internet applications are built based on it • Widely known for file-sharing and IM applications • P2P today accounts for more than 50% of the Internet traffic • What P2P does, it creates an overlay network for a set of specific applications • P2P provides actually a suite of technologies that solves today the problems of IMS

  24. What is so special about P2P technology? • Join/Leave: Nodes may come and go at any time, the network topology reconfigures itself • Lookup: The network can locate deterministically the node that serves a specific user or service • Routing: The network can route a message regardless of network topology changes and without manual re-configuration

  25. P2P solves the problem of the IMS, the cost • Self-organizing network (automatic disaster recovery) • Scalability limited by hardware • Cheap hardware resources in place of expensive servers • No idle components, all hardware assets are used • No need for monitoring, operations, engineering, planned maintenance

  26. Take necessary functions from IMS Picture contributed by Gonzalo Camarillo

  27. IMS design drastically optimized Picture contributed by Gonzalo Camarillo

  28. Isolate the necessary core functions • SIP Proxy • Media relay • DNS/ENUM • Voicemail • Presence • Profile database • Accounting

  29. Fold all services into a single box A single commodity box today can easily handle 50K SIP subscribers and more than 2000 media sessions.

  30. Play the hat-trick Build a self-organizing overlay network by using Peer-to-Peer technology and use the IMS-in-a-box as nodes

  31. Equal peers provide all functions

  32. From complexity to common sense simplicity

  33. SIP Thor technology • Follows the same design as MapReduce (Google) and Amazon EC2 (Dynamo) • First design that applied P2P on SIP core networks • No need for managing the infrastructure (just monitor if available resources > required capacity) • Adding a new server = Pizza-delivery, DHL can do it

  34. SIP Thor deployment status today • Development, then trials and bug fixes for 2 years • Two commercial deployments today (Cable and Fiber) • Free SIP service SIP2SIP.info • Reliable enough for a Tier 1 deployment scenario • To put it more simply, it works.

  35. Contact Information Thank you, You may contact me at: ag@ag-projects.com http://ag-projects.com

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