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VoIP 網路互連

VoIP 網路互連. 顯赫資訊 鄭鈞文 http://www.gentrice.net sip://sip.gentrice.net tel://886-2-22260665. Topic. 語音網路與資料網路 區網間的互連 區網內的戶連 學校內的互連 跨應用的戶連 由 SBC 看 voip 安全議題. Data network. LAN WAN WAN is not just a big LAN Addressing Routing. Voice Network. PBX PSTN

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VoIP 網路互連

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  1. VoIP 網路互連 • 顯赫資訊 • 鄭鈞文 • http://www.gentrice.net • sip://sip.gentrice.net • tel://886-2-22260665

  2. Topic • 語音網路與資料網路 • 區網間的互連 • 區網內的戶連 • 學校內的互連 • 跨應用的戶連 • 由SBC看voip安全議題

  3. Data network • LAN • WAN • WAN is not just a big LAN • Addressing • Routing

  4. Voice Network • PBX • PSTN • PSTN is not a collection of PBX • Numbering

  5. VoIP standard • H.323 • first industry standard • A set of protocol • SIP • Client-server, www style • H.248 • not in the scope of this presentation

  6. H.323 • LAN like architecture • Addressing: Dial number

  7. SIP • Internet architecture • Address: Email like syntax

  8. 互聯模式 • trusted • Ex: campus digital library • adv: security • non-trusted • Ex: E-mail • adv: convenience

  9. SIP port allocation • SIP server port : 5060 (destination) • client port could be any (source) • RTP • could be any, • one call use one UDP port

  10. 區網間的戶連

  11. case study: MOE

  12. Numbering plan • 9xx-xxxxx • 前三碼表單位，後五碼由單位自行運用 • 設計緣由 • 與未來070保持相容（冠070碼） • 避免與市話產生衝突

  13. 撥號流程示意

  14. ENUM • 9xx-xxxxx 不易記憶 • enum 機制 • 使用PSTN號碼當作mapping • 優點：原號撥碼 • 缺點：可能造成接通延遲(some solutions available)

  15. Enum protocol • RFC 3761 • RFC 2916 • use DNS system to translate E.164 number into IP address • Like SIP, H.323, Email... $ORIGIN 8.4.3.0.6.9.4.6.1.1.4.4.e164.arpa. NAPTR 10 100 "u" "E2U+sip" "!^.*$!sip:info@example.com!" . NAPTR 10 101 "u" "E2U+h323" "!^.*$!h323:info@example.com!" . NAPTR 10 102 "u" "E2U+msg" "!^.*$!mailto:info@example.com!" .

  16. 區網內的互連

  17. 案例探討 • 台南縣 • IP-PHONE為主，暫無pstn連接 • 桃園縣 • GW為主，系統業者收量 • 高雄縣 • BOT模式

  18. 常見編碼方式 • 070編碼 • 私有編碼 • 市話號碼編碼 • 9xx編碼

  19. 參考架構

  20. 常見問題 • F/W • Routing • Load balance device (2WAN)

  21. proxy server • Up-link to MoE • Register/account management • Routing / Special call routing • CDR • Number mapping • Media • force relay vs P2P

  22. 校內voip

  23. 校園voip • 一般常見架構 • Traditional PBX for 教職員 • VoIP for traveler • VoIP for remote campus • VoIP for students

  24. 傳統交換機界接 • Gateway solution • T1/E1 ISDN line • Analog line • Issue: Available port?

  25. VoIP Gateway • 撥話習慣，備援機制，上下車機制 • 常見問題： • FXO 於交換機內線 • 雷擊保護

  26. Internet user • Web call solution • SIP Softphone • Security issue • Via header

  27. Dial plan • PBX is a path connect to PSTN • Internet user should limit the access level

  28. Application 的互連

  29. Web call example

  30. Example 2

  31. Example 3--skype

  32. Ex: 4--Web meeting

  33. Important parts • Protocol conversion • Numbering plan • DTMF issue • In-band • Out-band • Back-end integration

  34. Codec • G.711, G.729, G.723 • G.722 • iLBC • Transcoding

  35. SessionBorderController

  36. 用途 • For access • 連接用戶端 • For peering • 連接其他sip domain

  37. 優缺點 • 優點 • 安全機制 • 修正部份協定錯誤 • 易於控管 • 缺點 • RFC 支援程度

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