VOIP CH 11

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Tjr31
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95221
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VOIP CH 11
Updated:
2011-07-25 21:34:19
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VOIP
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VOIP CH 11
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  1. is considered the latest version as ratified by ITU. H.323
    H.323v5 (version 5)
  2. created by ITU-T for transmitting audio and video and data
    H.323
  3. for Integrated Services Digital Network (ISDN)
    H.320
  4. for plain old telephone service (POTS)
    H.324
  5. Also called endpoints, terminals provide point-to-point and multipoint conferencing for audio and, optionally, video and data
    (end points at a work station)
    Terminals
  6. from ip based network to interconnect to Public
    Switched Telephone Network (PSTN) or ISDN networks for H.323 endpoint internetworking
    (ip based to PSTN or ISDN)
    gateways
  7. provide admission control and address translation services for terminals or gateways.
    (call control between device)
    Gatekeepers
  8. Devices that allow two or more terminals or gateways to conference with either audio and/or video sessions
    (conference calls)
    Multipoint control units (MCU)
  9. from analog to digital
    Encodes the signal from the audio equipment for transmission and decodes the incoming audio code
    audio codec
  10. Formats or recieves the transmitted audio, video, data, control streams, and messages onto network interface.
    Media transmission
  11. Provides H.225 and H.245 call control, capability exchange, messaging, and signaling of commands for proper operation of the terminal.
    system control unit
  12. Optional, but if provided, must be capable of encoding and decoding video according to H.261/H.263 standards.
    video codec
  13. call setup and teardown on both the IP network and pbx
    acts as an H.323 terminal or MCU on the network and an SCN (Switched Circuit Network )terminal or MCU on the SCN
    translates between audio,
    video, and data transmission formats as well as communication systems and protocols.
    gateway
  14. it does conversion and transcoding between the ip network(H.323 terminal) and the PBX network(SCN)
    gateway
  15. provides pre-call and call-level control services to H.323 endpoints.
    do have more then one so it can be redundent
    logically separated from the other network elements in H.323 environments.
    Gatekeeper
  16. who preforms the following
    Address Translation-Provides endpoint IP addresses
    (such as <pc1@cisco.com>) or E.164 addresses (standard phone numbers).
    Admissions Control- Provides authorized access, (ARQ/ACF/ARJ) messages
    Bandwidth Control- managing endpoint bandwidth requirements, BRQ/BCF/BRJ) messages
    Zone Management- Provided for registered terminals, gateways, and MCUs
    gatekeeper
  17. is an endpoint that supports multipoint conferences
    it supports centralized multipoint conferences
    consists of MC and MP
    MCU( multipoint control unit)
  18. supports conferences between three or more endpoints in a multipoint conference.
    can be resident in a terminal, gateway, gatekeeper, or MCU
    transmit the capability set to each endpoint
    multipoint controller (MC)
  19. receives audio, video, and/or data streams
    distributes them to endpoints participating in a multipoint conference
    multipoint processor (MP)
  20. protocols are supported by both reliable(TCP) and unreliable(UDP) packet delivery mechanisms over data networks
    supports call admissions, setup, status, teardown, media streams, and messages
    H.323
  21. Most H.323 implementations today use what protocol
    TCP
  22. Provides pre-call control in H.323 gatekeeper-based networks.
    Registration, Admissions and Status (RAS) Signaling
  23. Used to connect, maintain, and disconnect calls between endpoints.
    Call control signaling
  24. Provides the reliable H.245 channel that carries media control messages. The transport occurs with an unreliable UDP stream.
    Media control and transport
  25. a device that is between call set up and and a zone that is authenticated
    is established between endpoints and gatekeepers
    unreliable UDP connection
    independent of the call control signaling and media transport channels
    RAS Signaling
  26. The gatekeeper discovery multicast address is
    224.0.1.41
  27. the gatekeeper UDP discovery port is
    1718
  28. the gatekeeper UDP registration and status port is
    1719
  29. A multicast message sent by an endpoint looking for the gatekeeper.
    Gatekeeper Request (GRQ)
  30. The reply to an endpoint GRQ indicating the transport address of the gatekeeper’s RAS channel.
    Gatekeeper Confirm (GCF)
  31. Advises the endpoint that the gatekeeper does not want to accept its registration. This is usually due to a configuration on the gateway or gatekeeper.
    Gatekeeper Reject (GRJ)
  32. Enables gateways, endpoints, and MCUs to join a zone and inform the gatekeeper of their IP and alias addresses.
    Occurs after the discovery process, but before you can attempt any calls.
    Registration
  33. To obtain contact information when only alias information is available.
    Endpoint Location
  34. messages between endpoints and gatekeepers provide the basis for call admissions and bandwidth control
    by confirming or rejecting an request.
    Admissions
  35. gatekeeper can obtain status information from an endpoint
    to monitor whether the endpoint is online and offline due to a failure condition.
    status information
  36. is initially managed through the admissions exchange between an endpoint and the gatekeeper within the ARQ/ACF/ARJ
    looks only at its static bandwidth table to determine whether to accept or reject the bandwidth request.
    bandwidth controll
  37. In H.323 networks, call control procedures are based on International Telecommunication Union (ITU)
    Recommendation
    H.225
  38. which specifies the use and support of Q.931 signaling messages.
    h.225
  39. A reliable call control channel is created across an IP network on TCP port
    1720 (the well-known port for H.323).
  40. no gatekeeper involved but only to see requests and conformations (ARQ and ACF)
    Call signaling messages are sent directly between two endpoints
    Direct Endpoint Call Signaling
  41. Call signaling messages are routed through a gatekeeper
    q.931 goes between the end point and the gatekeeper
    alerting and connecting go through gatekeeper
    GKRCS (Gatekeeper Routed Call Signaling)
  42. Proxy designed for H.323 and its at what level
    application layer (Layer 7)
  43. Can manage QoS for a terminal that doesn’t support
    RSVP
  44. a hybrid system constructed of centralized intelligent gatekeepers, MCUs, and less intelligent endpoints (terminals)
    H.323
  45. When high-density gateways are needed for PSTN interconnection, alternatives such as
    Media Gateway Control Protocol (MGCP) and H.248 (MEGACO)
  46. cisco prioperty end point is
    skinny
  47. sip is more common in an
    endpoint

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