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

CC_EC_ReqCircuitUnavail

41

CC_EC_ReqFacilityNotImp

42

CC_EC_ReqFacilityNotSubscr

43

CC_EC_ResourcesUnavailUnspec

44

CC_EC_ResponseToStatusEnquiry

45

CC_EC_RouteOutOfService

71

CC_EC_RoutingError

93

CC_EC_SelectiveCallBarring

104

CC_EC_ServiceIncompatible

64

CC_EC_ServiceOrOptionNotAvail

47

CC_EC_ServiceOrOptionNotImpUnspec

46

CC_EC_ServiceTemporarilyUnavailable

77

CC_EC_ServiceUnavailable

78

CC_EC_SignalNotUnderstood

73

CC_EC_SignalNotValid

74

CC_EC_SignallingSystemIncompatible

76

CC_EC_SpecialInformationTone

82

CC_EC_SubAbscent

91

CC_EC_SubControlledIcb

101

CC_EC_SubNotFoundDle

115

CC_EC_SubscriberCallTerminate

109

CC_EC_SubscriberIncompatible

72

CC_EC_SubscriberMoved

114

CC_EC_SubscriberOutOfService

75

CC_EC_SuspendExistButNotThisId

48

CC_EC_SwitchingEquipCongestion

49

CC_EC_TemporaryFailure

50

CC_EC_TemporaryOos

106

CC_EC_TerminalCongestion

117

CC_EC_Transferred

80

CC_EC_TranslationOos

112

CC_EC_UnallocatedDestNumber

89

CC_EC_UnallocatedNumber

51

CC_EC_UndefinedBg

92

CC_EC_Unknown

144

CC_EC_UnrecElemPassedOn

90

CC_EC_UserBusy

52

CC_EC_UserNotMemberOfCug

83

CC_EC_VacentCode

119

CC_EC_WhitelistCliNotMatched

138

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

D-3

 

 

 

 

 

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Cisco Systems manual Cisco H.323 Signaling Interface User Guide
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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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