Appendix E E-ISUP Cause Value-to-Name Lookup

42CC_EC_ReqFacilityNotImp

43CC_EC_ReqFacilityNotSubscr

44CC_EC_ResourcesUnavailUnspec

45CC_EC_ResponseToStatusEnquiry

46CC_EC_ServiceOrOptionNotImpUnspec

47CC_EC_ServiceOrOptionNotAvail

48CC_EC_SuspendExistButNotThisId

49CC_EC_SwitchingEquipCongestion

50CC_EC_TemporaryFailure

51CC_EC_UnallocatedNumber

52CC_EC_UserBusy

53CC_EC_InterceptedSubscriber

54CC_EC_AccessBarred

55CC_EC_Acknowledgement

56CC_EC_AddressIncomplete

57CC_EC_Busy

58CC_EC_ChannelOutOfService

59CC_EC_DteControlledNotReady

60CC_EC_Congestion

61CC_EC_CallTerminated

62CC_EC_FacilityNotRegistered

63CC_EC_IncomingCallsBarred

64CC_EC_ServiceIncompatible

65CC_EC_MessageNotUnderstood

66CC_EC_NetworkAddressExtensionError

67CC_EC_NetworkTermination

68CC_EC_NumberUnobtainable

69CC_EC_PriorityForcedRelease

70CC_EC_Reject

71CC_EC_RouteOutOfService

72CC_EC_SubscriberIncompatible

73CC_EC_SignalNotUnderstood

74CC_EC_SignalNotValid

75CC_EC_SubscriberOutOfService

76CC_EC_SignallingSystemIncompatible

77CC_EC_ServiceTemporarilyUnavailable

78CC_EC_ServiceUnavailable

79CC_EC_DteUncontrolledNotReady

80CC_EC_Transferred

81CC_EC_IncomingCallsBarredInCug

82CC_EC_SpecialInformationTone

83CC_EC_UserNotMemberOfCug

84CC_EC_MisdialledTkPrefix

85CC_EC_ParamUnrecPassed

86CC_EC_Proprietary

87CC_EC_Preemption

88CC_EC_PreemptionCctUnavailable

89CC_EC_UnallocatedDestNumber

90CC_EC_UnrecElemPassedOn

91CC_EC_SubAbscent

92CC_EC_UndefinedBg

93CC_EC_RoutingError

94CC_EC_PrecedenceBlocked

95CC_EC_CallTypeIncompatible

96CC_EC_GroupRestrictions

97CC_EC_CallingPartyOffHold

98CC_EC_CallingDroppedWhileOnHold

99CC_EC_NewDestination

100CC_EC_OutgoingCallsBarred

101CC_EC_SubControlledIcb

102CC_EC_CallRejectCallGapping

103CC_EC_RejectedDivertedCall

104CC_EC_SelectiveCallBarring

105CC_EC_RemoteProcError

 

Cisco H.323 Signaling Interface User Guide

E-2

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Cisco Systems H.323 manual Appendix E E-ISUP Cause Value-to-Name Lookup

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.