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Into the Cloud Future Direction of Video Conferencing

Into the Cloud Future Direction of Video Conferencing. Simon Horne H323.net 11 February 2010. What is h323.net. Open standard Open source (GnuGk gatekeepers) Open network Free Service Direct Media NAT Traversal Technology. What’s with this cloud?.

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Into the Cloud Future Direction of Video Conferencing

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  1. Into the CloudFuture Direction ofVideo Conferencing Simon Horne H323.net 11 February 2010

  2. What is h323.net • Open standard • Open source (GnuGk gatekeepers) • Open network • Free Service • Direct Media NAT Traversal Technology

  3. What’s with this cloud? • Walled private network of virtual computers • No physical box no physical location • Elastic: network can expand/contract when required

  4. Conferencing in a Cloud? Issues • No such thing as “Real Time” in the virtual world • The Cloud has a firewall. • The Cloud has a NAT! (external addresses mapped to internal) Advantages • Cost: Up to 75+% cheaper then a physical box • Services added quickly without huge expense • Centralised location

  5. NAT Traversal • Whether IPv6 or not, NAT is part of the furniture • H.323 in the only protocol with a standard solution for NAT Traversal (H.460.18/.19/.23/.24) • The key solution to traversing NAT is to understand how the NAT behaves and work with it. • Calls should never fail because of NAT • Callers should be advised that a call cannot be routed due to NAT

  6. NAT Traversal Standards • H.323 • H.460.18 Traversal of Signalling • H.460.19 Traversal of Media (proxying) • H.460.23 NAT Determination • H.460.24 Point to Point Media (proxy offload) • H.460.17 Tunneling RAS over TCP connection (TCP Keep-Alive) • H.460.15 Signalling suspension and redirection • SIP • NONE Drafts draft-ietf-mmusic-ice (6 years 19 rev 120pages 2 years idle in editors queue) draft-ietf-behave-turn (9 years 14 rev still work in progress) Big move to Peer to Peer SIP? (Author of documents now works for Skype)

  7. Direct Media

  8. h323.net Direct Registration T Internet GK T T Firewall T • Terminals (T) and Gatekeeper (GK) must support NAT/FW traversal standards

  9. h323.net Gk Registration T Internet GK T GK SIP Firewall T • Gatekeeper must proxy signaling and media on behalf of endpoints

  10. Peering with h323.net T Internet T GK T DMZ Firewall T T • Gatekeeper In the DMZ: ENUM and/or SRV DNS records point to public IP of Firewall

  11. Campus Example DMZ Firewall T GK STUN MCU T T T T T T T T T T T • All calls are direct except calls out of the network

  12. Network Standards • H323v4 • H323 Annex O URI dialling • ENUM RFC 3761 • Direct Media H.460.18/.19/.23/.24 • H.245 Tunnelling • Audio G.711, G.729 • Video H.263

  13. Call Routing • DNS (h323:user@domain) • E.164 (via nrenum.net) • GDS (Internet2) • All registrations assigned an E.164 number (87840) and @h323.net URI so can send and receive either format.

  14. New Services • Presence • File Transfer • Text Messaging • Multimedia messaging • Cloud based MCU’s • Termination to/from 3G, PSTN • Bridging to Skype • H.325 type services

  15. References • Open community specifications • www.h323forum.org/specifications • GnuGk Project • www.gnugk.org • H323Plus • www.h323plus.org • PacPhone • www.pacphone.com • Packetizer • http://www.packetizer.com/ipmc/h323/

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