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H.323

H.323. Recommendation published by ITU Ties together a number of protocols to allow multimedia transmission through an unreliable packet-based network 1996: approved by ITU 2003: Version 5 H.323 Architecture H.323 Terminal Gateway Gatekeeper Multipoint Control Units (MCU).

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H.323

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  1. H.323 Recommendation published by ITU • Ties together a number of protocols to allow multimedia transmission through an unreliable packet-based network • 1996: approved by ITU • 2003: Version 5 • H.323 Architecture • H.323 Terminal • Gateway • Gatekeeper • Multipoint Control Units (MCU)

  2. H.323 Protocol Stack for VOIP

  3. H.323 and Associated Recommendations

  4. H.323 Control Protocols • H.225 (RAS)- protocol between terminal and gatekeeper (if present) allows terminals to join/leave zone, request/return bandwidth, provide status updates, … • H.245 (Call Control) - Media Control Protocol Allows terminals to negotiate connection parameters (codec, bit rate, ..) • Q.931 (Call Signalling) - Manages call setup and termination

  5. H.323 Adapted to IP

  6. H.323 Terminals

  7. Supported Protocols and Integration Options (Cont.) FAX ATA Analog Phones H.323 ATA Skinny Analog Skinny

  8. Supported Protocols and Integration Options (Cont.) CallManager Cluster H.323 Connections Vmail PSTN CME H.323 H.323 H.323 WAN H.323 CME Recommended

  9. Supported Protocols and Integration Options (Cont.) Cisco CME can register to a H.323 gatekeeper thereby ensuring the WAN is not oversubscribed H.323 WAN Register Register 1000 2095551000 2000 3095552000 Gatekeeper Register Extension number and/or E.164 number Register Extension number and/or E.164 number

  10. Translation Between Signaling and Call Control

  11. H.323 Gatekeepers

  12. RAS Messages

  13. H.323 Basic Call Setup

  14. Finding and Registering with a Gatekeeper

  15. Call Flow with a Gatekeeper

  16. Gatekeeper-Routed Call Signaling

  17. Call Flow with Multiple Gatekeepers

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