Appendix F H.323 Name-to-Cause Value Lookup

CC_HC_NumberChanged

22

CC_HC_OnlyRestrictedDigitalBearerInfoCapability

70

CC_HC_OutgoingCallsBaredWithinCUG

53

CC_HC_ParameterNonExistantOrNotImplementedPassedOn

103

CC_HC_PermanentFrameModeConnectionOperational

40

CC_HC_PermanentFrameModeConnectionOutOfService

39

CC_HC_PrecedenceCallBlocked

46

CC_HC_Preemption

8

CC_HC_PreemptionCircuitReservedForReuse

9

CC_HC_QualityOfServiceNotAvailable

49

CC_HC_RecoveryOnTimerExpiry

102

CC_HC_RedirectionToNewDestination

23

CC_HC_RequestedCircuitChannelNotAvailable

44

CC_HC_RequestedFacilityNotImplemented

69

CC_HC_RequestedFacilityNotSubscribed

50

CC_HC_ResourceUnavailable

47

CC_HC_ResponceToStatusEnquiry

30

CC_HC_SendSpecialInformationTone

4

CC_HC_ServiceOrOptionNotImplemented

79

CC_HC_ServiceOrOptionUnavailable

63

CC_HC_SubscriberAbsent

20

CC_HC_SwitchingEquipmentCongestion

42

CC_HC_TemporaryFailure

41

CC_HC_UnallocatedNumber

1

CC_HC_UserBusy

17

CC_HC_UserNotMemberOfCUG

87

 

Cisco H.323 Signaling Interface User Guide

F-2

OL-4806-01 Rev. A14

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Cisco Systems manual Appendix F H.323 Name-to-Cause Value Lookup
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H.323 specifications

Cisco Systems H.323 is a set of standards designed for transmitting audio, video, and data over packet-switched networks. It is a critical technology that enables real-time communication and has become integral to the world of VoIP (Voice over Internet Protocol) and video conferencing applications. Originally developed by the ITU-T, H.323 has been widely adopted and implemented by Cisco Systems, allowing organizations to leverage reliable and scalable communication solutions.

One of the standout features of H.323 is its ability to support interoperability among varying equipment and platforms. This means that devices from different manufacturers can communicate seamlessly, which is vital in a diverse technical environment. H.323 does this by defining protocols that handle signaling, media transport, and control, ensuring that various systems can work together effectively.

Key technologies utilized within H.323 include H.225 and H.245 signaling protocols. H.225 is responsible for call setup and management, establishing communication between endpoints. In contrast, H.245 manages the negotiation of media channels, allowing devices to configure themselves based on the capabilities of each other. This adaptability is crucial for dynamic network conditions typical in VoIP applications.

Another defining characteristic of H.323 is its support for multiple types of multimedia communication, including point-to-point and multipoint calls. This flexibility supports everything from simple audio calls to complex videoconferencing setups, where many participants can share video and audio streams concurrently. Cisco enhances this capability through its hardware and software offerings, optimizing performance for conference calls.

H.323 also features robust error resilience mechanisms. This ensures that real-time data, which is typically sensitive to delays and losses, can be transmitted with minimal disruption. Moreover, it facilitates quality of service (QoS) implementation, allowing organizations to prioritize voice and video traffic over less critical data services, thereby improving the overall user experience.

In conclusion, Cisco Systems H.323 stands out as a comprehensive solution for real-time communication over packet-based networks. Its main features, including interoperability, multimedia support, and enhanced error resilience, position it as a relevant technology in both corporate and personal communication settings. As organizations continue to adopt cloud and hybrid communication models, H.323 remains a reliable backbone for ensuring connectivity and collaboration across diverse platforms.
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