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Understanding VoIP Development: A Shift from Centralized to Distributed Networks

This document explores the evolution of Voice over Internet Protocol (VoIP) technology, highlighting the transformation from traditional centralized systems to modern distributed networks. It examines key components like H.323 protocols, gateways, and the role of bandwidth management to ensure quality of service. It also addresses end-user perspectives on VoIP solutions, including cost considerations and ease of installation for small office and home setups. Various community resources and relevant links for further exploration are included to enrich understanding.

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Understanding VoIP Development: A Shift from Centralized to Distributed Networks

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  1. VoIP Onno W. Purbo onno@indo.net.id

  2. Arah Perkembangan

  3. Philosophy • The old world • Box reliability • Centralized • The new world • Network availability • Distributed

  4. References • http://www.cisco.com • http://www.lucent.com • http://www.xl.com • http://www.quicknet.net • http://openh323.org • http://openphone.org • http://www.pulver.com

  5. Outline • End User Perspective • Conceptual Framework • Next Generation Telco ..

  6. End User - Internet Telephone

  7. Komponen VoIP / Menit • Telkom Rp. 75 / menit • ISP Rp. 75 / menit • Hook-off Service • http://www.net2phone.com • Delay <250ms

  8. Biaya SLI / Menit (1US$=Rp8000)

  9. Solusi Kantor Kecil / Rumah • Satu (1) Saluran VoIP • Internet PhoneJACK US$150 • Internet LineJACK US$220 • Internet PhoneCARD US$170

  10. Komunitas WARNET • Asosiasi-warnet@itb.ac.id • Free subscribe: • Asosiasi-warnet-subscribe@itb.ac.id • Komunitas e-commerce • Mastel-e-commerce@egroups.com • Warta-e-commerce@egroups.com • E-commerce@itb.ac.id

  11. Kebutuhan WARNET • Line telepon koin • Leased line analog Regional Network / DIVNET • Akses ke box JAMUS V.35 / RS.449

  12. WARNET “tanpa” Telkom WARNET ke Internet • Satellite DirectPC – US$200 / card • KabelVision – Rp. 300.000 / bulan Jaringan WARNET • 2-11 Mbps 2.4 GHz US$250 / card

  13. Teknologi VoIP sederhana

  14. Internet Telephone

  15. Dialer

  16. Video Conference

  17. Internet PhoneJACK

  18. Connection PhoneJACK

  19. Internet PhoneCARD

  20. Voice Quality Comparison

  21. Solusi Gateway Sederhana

  22. VoiceTronix (8 port)

  23. VoIP untuk WARNET • Investasi WARNET+ • Invest Card DSP ~US$150 / kanal. • Estimasi ke US biaya / menit • US$0.13 + Rp. 75 + Rp. 75 • Estimasi ke US biaya SLI 001 • Rp. 9900-8300 / menit

  24. Issue Desktop VoIP Solution • Ease of Installation. • Infrastructure. • Flexibility. • Compatibility. • Ease-of-Use. • Quality. • Cost • Growth Path. • Base for Applications.

  25. Aplikasi Desktop VoIP • IntraNet Communication • Remote Call Forwarding • Distributed Call Center • Virtual PBX • Line Doubling • Personal Iphone Calling

  26. Personal Iphone Calling

  27. Intranet Communications

  28. Remote Call Forwarding

  29. Distributed Call Center

  30. Virtual PBX

  31. Line Doubling

  32. Mobile User

  33. Mobile User • Internet Locator Service (ILS) • Mapping Name Number  Dynamic IP

  34. Internet Locator Service (ILS) • http://www.icq.com • ILS & chat system • http://www.tzo.com • Dial your DNS name.

  35. Conceptual Framework • H.323

  36. H.323 Benefit • Codec Standards. • Interoperability. • Network Independence. • Platform & Application Independence. • Multipoint Support. • Bandwidth Management. • Multicast Support. • Flexibility. • Inter-Network Conferencing.

  37. H.323 mengatur .. • Video Codec (H.261 dll). • Audio Codec (G.711, G.723 dll). • Data channel (T.120 dll) e-board dll. • System Ctrl Unit (H.245, H.225.0 dll). • H.225.0 layer – error detection, error correction and frame sequencing.

  38. Open Standard

  39. Komponen H.323 • Terminal • Gateway • Gatekeeper • Multipoint Control Unit (MCU)

  40. Terminal H.323 • Provide Real-Time. • Provide Two-way communications. • H.245 – nego channel usage & capabilities. • Q.931 – Registration/Admission/Status (RAS). • T.120 – Data Conferencing Protocols.

  41. Komponen H.323 • H.323 Gateway • Interface H.323 terminal – WAN terminal. • H.323 Gatekeeper • Address Translation (E.164 – IP) • Admission Control. Authentication. • Bandwidth Control. • Zone Management. • Call Control & Management • (e.g. VoIP – PSTN)

  42. H.323 Gateway • Optional! • Translation function between H.323 conferencing endpoints and other terminal types. • Translation between transmission formats (i.e. H.225.0 to H.221). • Translation between communications procedures (i.e. H.245 to H.242). • Translation between audio and video codecs. • Performs call setup and clearing on both the LAN side and the PSTN side.

  43. H.323/PSTN Gateway

  44. Gatekeeper • The most important component asct as a virtual switch of an H.323 enabled network. • It acts as the central point for all calls within its zone and provides call control services to registered endpoints.

  45. Gatekeeper • Address translation from LAN aliases for terminals and gateways to IP or IPX addresses (e.g E.164 – IP) • Bandwidth management. • Route H.323 calls. • Bill for calls.

  46. Gatekeeper Zone

  47. Isu Quality of Service (QoS) • Kekurangan Bandwidth • Delay terlalu lama. • Jitter / Variasi delay.

  48. QoS • Resource Reservation Protocol (RSVP) • Real Time Protocol (RTP) • Compressed Real Time Protocol (CRTP) • Traffic Shaping • Queuing: Custom Queuing, Weighted Fair Queuing. • Congestion Control: Random Early Detection. • Effisiensi Jaringan: link fragmentation & interleaving.

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