v4/v6 dual stack voip network planning case study : tanet voip 交換平台
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v4/v6 dual stack voip network planning
case study : TANET VOIP 交換平台
顯赫資訊Kaiser
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教育部交換平台
• 教育部自編門號• 超過千所學校互連• 封閉型編碼• 標準 sip 協定
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Voip numbering• 9xx-yyyyy
– 9xx, 單位 (14 區網, 25 縣市網)– V4 only now
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IP v4/v6 issue in voip service
• IP v4/v6 in– UA (IP-Phone, GW, softphone…. )
– Proxy server
– IP-PBX (B2BUA)
– Application (ex: MCU, enum…)
• We can not replace all IPv4 SIP device over night– UA (CPE) support dual stack
– SIP server support dual stack
• Heavy loading– in sip for sip translation between 4/6.
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VoIP IPv6
• CPE– Dual stack?– Dual UA ?
• Server– V6 in a single thread
• V4 voip is stable now
– V4 + V6 dual transport
• B2BUA Translation– RTP header rewrite – No P2P
• GW– None in market
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SIP server
• Call type– V4<-->V4– V4<-->V6– V6<-->V6
• Translation– Signaling , need to be done in B2BUA – RTP
• V6 logo • Enum
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Test items
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SIP Message
• Application layer• SIP is plain text• Broken V4 UA
– Host:port 192.168.0.100:5060
– v6 addr fe80::219:e3ff:fe05:42a0
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Peer to Peer VoIP
• IPv4– Nat issue
• IPv6– V6 to V6, no problem (expect B2BUA)
– V4 to V6
– V6 to V4
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302 move temporary
• 有效降低 v4/v6 上的 voip 轉換– 話機需能支援 302 後的 new invite
– Server 需能判斷話機是否支援 dual stack
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302 call flow
45670(dual stack)
RTP Stream(IPv4)
PROXY(dual stack)
45674(IPv4 only)
1.INVITE(IPv6)
5.INVITE(IPv4)
6.200 OK(IPv4)7.200 OK(IPv4)
8.ACK(IPv4) 9.ACK(IPv4)
2.302 Move Temporarily (IPv6)
4.INVITE(IPv4)
3.200 OK(IPv6)
Source: 台南市教育局
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Case study
• 雲林縣– All ip-phone in v6 network, now over 1000+ phone – PSTN GW still in v4– 桃園、澎湖 follow v6 only in ipphone
• 台南– V6 in new phone number block– V6 call first, v4 failfall
• 北縣– V4 major, V6 in selected phone
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V6 IP-Phone
• Too many v4 only NAT box in campus– IP-PHONE 跑 v6 造成困難
• Core switch/ L2/ L3 switch• TANET release more v4 IP to reduce NAT
environment.
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結論
• V6 可有效加速 voip deployment
• 日本企業網路優先配發 v6
• dual stack 是未來趨勢– 如果降低 v4/v6 轉換 是未來 service provider
需考量的一環– 新的相關參數的制定– 台灣經驗
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