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VoIP Overview and Futures

VoIP Overview and Futures. John Barlow AARNet / GrangeNet Thanks to Stephen Kingham APAN Conference 22 – 24 January 2003. Topics to Cover. AARNet background Peering H.323 & SIP Soft PaBX Video Conference Multipoint Control Unit. AARNet background. About 20,000 VoIP calls each day

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VoIP Overview and Futures

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  1. VoIP Overview and Futures John Barlow AARNet / GrangeNet Thanks to Stephen Kingham APAN Conference 22 – 24 January 2003

  2. Topics to Cover • AARNet background • Peering • H.323 & SIP • Soft PaBX • Video Conference • Multipoint Control Unit

  3. AARNet background • About 20,000 VoIP calls each day • Over 15 (almost half) Australian universities use VoIP for toll-bypass • One university purely VoIP • Over 3000 VoIP handsets (all H.323) • Billing, QoS, monitoring • http://voip.aarnet.net.au/AARNet/

  4. Peering • Proxy • Firewall • QoS • Billing/settlement • International peering project

  5. Proxy

  6. Firewall • Difficult to find a firewall product that allows H.323 and SIP through securely • Use of a proxy would help

  7. Quality of Service • QoS is required – we can not afford to “throw bandwidth at the problem” • Examples of QoS include H.323 video conferencing to this meeting – it is required, and we should all provide it • QoS is difficult due to potential for a DOS attack – need proxy and QoS rate limiting ?

  8. Billing • Within your group you may have to perform “cost recovery” of your IP telephony equipment (central gatekeeper, etc.) • Outside your group you might choose no cost peering relationship • Next step may include access to “call hop-off” in remote countries, possibly requiring more cost recovery

  9. International Peering Project • Using H.323 there are “world root gatekeepers” (much like root DNS servers). • http://www.vide.net/workgroups/nasm/resources/vrla.shtml

  10. Dial Plan Egon Verharen has written up a great primer on the Global Dialing Scheme (GDS) which is enormously helpful for video conferencing. In Australia we can call people on the GDS but they can not call us. In Australia today we support the international dialplan and the Australian dialplan, ie just the <OP><EN> or the <CC><OP><EN> (see below). Trying to support both is a problem! Sometime in the new year we will be publishing a discussion paper and organising a virtual conference so that we can discuss what we should have as a dialplan "within" Australia.

  11. Root Gatekeepers

  12. H.323 & SIP • Different protocols to achieve the same goal • Reasonably easy to translate between them • Expect proxy/translation units to be common

  13. Soft PaBX • New features and functionality now possible • Voice mail Available via email • Soft phone (eg: receive a call on my laptop) • Extra features easily added (unlike PaBX) • LDAP/X.500 directory service

  14. Video Conference • This is H.323 – not just VoIP, but video conferencing

  15. Multipoint Control Unit • Allows multiple people in a conference (where H.323 is normally point-to-point). • Blends Video over IP, Voice over IP, ISDN video and PSTN voice conferencing. • One way to easily handle remote teaching

  16. Contact Details and Questions http://www.aarnet.edu.au/engineering/projects/voip/ John.Barlow@aarnet.edu.au Phone: +61 2 6222 3553 Mobile: +61 413 880 207 Stephen.Kingham@csiro.au Phone +61 2 6276 6223 Mobile +61 419 417 471

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