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CERN Fixed Telephony Service Development

This project aims to replace the outdated Alcatel PABX system with a software-based solution using open-source components and VoIP protocols. The goal is to reduce costs, increase flexibility, and avoid vendor lock-in.

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CERN Fixed Telephony Service Development

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  1. CERN FixedTelephonyServiceDevelopment HEPiXAutumn 2019 Workshop – October 2019

  2. A Bit of History

  3. Legacy Phone Infrastructure • Alcatel PABX • Running since 1990s • Monolithic design • Ageing hardware • Decayingcabled infrastructure • Growinglicensecosts • Not designed for VoIP

  4. Project Goals • Avoid Vendor lock-in • Reduceoperationalcosts • Increaseflexibility to add new services • Replace the PABX by a software-based solution • … using Open-source components • … that uses VoIP standard protocols (SIP) • … built on top of IT’s Agile Infrastructure • … with minimum resources

  5. A Joint Project: DialTone CS: Backend (PABX and SIP gateways) CDA: Dial Clients (hardware and software) Between 2 CERN IT groups:

  6. Phone Backend

  7. Backend Architecture

  8. Ensuring a Critical Service • Hybrid bare-metal and Openstack VMs (all puppet-managed) • 2 new telephony hubs in Meyrin and Prévessin: • Dedicated subnet and routers • Direct fiber links to red phone sites • DNS-failure proof • Long-duration batteries • Connection to PSTN operators

  9. Client Interface • Dial.js • Includedin the webRTC client • Leverages TONE’s built-in redundancy • Exposes a single JS API for desktop and mobile clients • A REST microservice provides additional features

  10. Client/Server Architecture

  11. Few Challenges Authentication Front-end server adaptation Advanced features server Mobile Application

  12. Authentication

  13. Front-end Server Adaptation • Authentication • Custom SIP headers for authentication. • Module for OAuth communication. • Save and keep state. • RTPengine • Calls from webRTC client to PSTN require extra component to handle media conversion and negotiation • Websockets • SIP doesn’t specify transport but usually plain TCP/UDP is used.

  14. Advanced Features Server • REST API • Server to enable/disablefeaturesdirectlyrelated to telephony

  15. Mobile App Workflow

  16. Phone Clients

  17. Technology • webRTC • Client media management • Multiplatform • Existing in-house experience • SIP • PABX connection • SIP.js

  18. Technology • Mobile clients • Platform • React Native • Libs • React-native-callkeep • React-native-webrtc • React-native-firebase • Tone-js-api • OS • Android • iOS • Desktop clients • Platform • React • Electron • Libs • Redux • Semantic-ui-react • Tone-js-api • Electron-updater • OS • Windows • Mac • Ubuntu 18 • CentOS 7

  19. Architecture Document reference

  20. Features (1/2)

  21. Features (2/2)

  22. Roadmap • Nov. 2019 • Simple mobile client • Chat • Dec. 2019 • Call transfers • Managers e-group • Jan. 2020 • Simultaneous calls • Feb. 2020 • Team Members • Missed calls • Mar. 2020 • Ad-hoc conference • Apr. 2020 • Complete mobile client • Voice Messages • Sep. 2020 • Advanced Call Logs • Dec. 2020 • Voice Recording

  23. Provisioning

  24. CERN Resources Portal Document reference

  25. IP Phones Provisioning • New auto-provisioning server for Polycom IP phones • Automated redirection from old (SfB) server • Stillmissing • Authentication of phones

  26. Documentation https://fixed-telephony-service.docs.cern.ch/

  27. Pilot juststarted!

  28. Thank you! https://fixed-telephony-service.docs.cern.ch/ https://github.com/cern-phone-apps IT-CDA René Fernandez Sanchez Lorys Lopez Thomas Baron IT-CS Rodrigo Sierra Moral Francisco Valentin Vinagrero Joao Garrett Paixao Florencio

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