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

	CC_EC_IncomingCallsBarred	63
	CC_EC_IncomingCallsBarredInCug	81
	CC_EC_IncompatibleDest	15
	CC_EC_InconOutgoingAccAndSubClass	126
	CC_EC_InterceptedSubscriber	53
	CC_EC_InterworkUnspec	16
	CC_EC_InvalidCallRef	143
	CC_EC_InvalidCallReferenceValue	17
	CC_EC_InvalidElemContents	18
	CC_EC_InvalidMsgUnspec	19
	CC_EC_InvalidNumberFormat	20
	CC_EC_InvalidTns	21
	CC_EC_MandatoryElementMissing	22
	CC_EC_MesgWithUnrecElemDiscarded	128
	CC_EC_MessageNotUnderstood	65
	CC_EC_MisdialledTkPrefix	84
	CC_EC_MisroutedCallPortedNumber	142
	CC_EC_MsgInWrongState	23
	CC_EC_MsgTypeNotImp	24
	CC_EC_MsgTypeNotImpOrWrongState	25
	CC_EC_NetworkAddressExtensionError	66
	CC_EC_NetworkOutOfOrder	26
	CC_EC_NetworkTermination	67
	CC_EC_NewDestination	99
	CC_EC_NoAnswerAlertedUser	28
	CC_EC_NoCallSuspended	27
	CC_EC_NoCircuitAvailable	29
	CC_EC_NoRouteToDest	33
	CC_EC_NoRouteToTns	34
	CC_EC_NoUserResponding	35
	CC_EC_NonExistentCug	127
	CC_EC_NonSelectedUserClearing	30
	CC_EC_NormalClearing	31
	CC_EC_NormalUnspecified	32
	CC_EC_NumberChanged	36
	CC_EC_NumberUnobtainable	68
	CC_EC_OnlyRestrictDigInfoBearer	37
	CC_EC_OperatorPriorityAccess	107
	CC_EC_OutOfCatchmentArea	111
	CC_EC_OutgoingCallsBarred	100
	CC_EC_OutgoingCallsBarredInCug	125
	CC_EC_ParamUnrecPassed	85
	CC_EC_PermanentFrameModeOos	130
	CC_EC_PermanentFrameModeOperational	131
	CC_EC_PermanentIcb	113
	CC_EC_PortedNumber	139
	CC_EC_PrecedenceBlocked	94
	CC_EC_Preemption	87
	CC_EC_PreemptionCctRes	129
	CC_EC_PreemptionCctUnavailable	88
	CC_EC_Prefix0DialledInError	120
	CC_EC_Prefix1DialledInError	121
	CC_EC_Prefix1NotDialled	122
	CC_EC_PriorityForcedRelease	69
	CC_EC_Proprietary	86
	CC_EC_ProtErrThresholdExceeded	124
	CC_EC_ProtocolErrorUnspec	38
	CC_EC_QualityUnavail	39
	CC_EC_RecoveryOnTimerExpiry	40
	CC_EC_RedirectionToNewDest	140
	CC_EC_Reject	70
	CC_EC_RejectedDivertedCall	103
	CC_EC_RemoteProcError	105
	CC_EC_RepeatAttempt	118
	Cisco H.323 Signaling Interface User Guide
	Cisco H.323 Signaling Interface User Guide

D-2		OL-4806-01 Rev. A14
D-2		OL-4806-01 Rev. A14

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.

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

Models: H.323

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

H.323 specifications