Conference.ConferenceActionCompletionHandlerWithStringResult Delegate

Avaya Client Services API Reference (Windows)

Avaya.ClientServices

AbstractShape Class

AcceptCallRequestEventArgs Class

AccessControlBehavior Enumeration

AcousticEchoCancelAlgorithm Enumeration

AcsConfiguration Class

ActiveParticipant Class

ActiveParticipant.ParticipantActionCompletionHandler Delegate

AddContactEventArgs Class

AddressDigit Enumeration

AddressValidationResponse Class

AddressValidationWatcher Class

AgentConfiguration Class

AgentError Enumeration

AgentErrorEventArgs Class

AgentException Class

AgentFeature Class

AgentFeatureInvocationResultWithButtonLampState Class

AgentFeatureType Enumeration

AgentInformation Class

AgentInformationEventArgs Class

AgentLogoutOverrideType Enumeration

AgentService Class

AgentService.AgentFeatureButtonLampCompletionHandler Delegate

AgentService.AgentServiceCompletionHandler Delegate

AgentService.SupervisorAssistCompletionHandler Delegate

AgentState Enumeration

AgentStateEventArgs Class

AgentWorkMode Enumeration

AgentWorkModeEventArgs Class

AlertType Enumeration

AllowedVideoDirection Enumeration

AllowedVideoDirectionChangedEventArgs Class

AllRegistrationsFailureEventArgs Class

AmmConfiguration Class

AsynchDataProgress Class

Attachment Class

Attachment.CompletionHandler Delegate

AttachmentStatus Enumeration

AudioConfiguration Class

AudioDetails Class

AudioMuteFailureEventArgs Class

AudioMuteStatusChangedEventArgs Class

AuthenticationMethod Enumeration

Autodial Class

AutodialError Enumeration

AutodialErrorEventArgs Class

AvayaMessagingConfiguration Class

BaseContact Class

BaseContactField Interface

BaseContactMultiValueField(T) Interface

BfcpConfiguration Class

BfcpMode Enumeration

BooleanEventArg Class

BusyIndicator Class

ButtonCustomizationError Enumeration

ButtonCustomizationErrorEventArgs Class

ButtonCustomizationPolicy Enumeration

ButtonLampState Enumeration

ButtonModuleService Class

ButtonModuleService.ButtonCustomizationCompletionHandler Delegate

ButtonType Enumeration

Call Class

Call.CallCompletionHandler Delegate

Call.JoinStatusHandler Delegate

Call.ReadAudioDetailsCompletionHandler Delegate

Call.ReadVideoDetailsCompletionHandler Delegate

Call.TransferStatusHandler Delegate

CallCreationInfo Class

CallDenialPolicy Enumeration

CallEndedEventArgs Class

CallEndReason Enumeration

CallError Enumeration

CallEventArgs Class

CallFailureEventArgs Class

CallFailureException Class

CallFeatureService Class

CallFeatureService.AutodialUpdateCompletionHandler Delegate

CallFeatureService.FeatureCompletionHandler Delegate

CallFeatureService.FeatureLabelCompletionHandler Delegate

CallForwardingCause Enumeration

CallForwardingInformation Class

CallForwardingStatus Class

CallLogAddressSourceType Enumeration

CallLogItem Class

CallLogItemActionType Enumeration

CallLogItemReadStatus Enumeration

CallLogItemSourceType Enumeration

CallLogOperationData Class

CallLogOperationStatus Enumeration

CallLogOperationStatusArgs Class

CallLogParticipant Class

CallLogService Class

CallLogService.CallLogActionCompletionHandler Delegate

CallLogServiceEventArgs Class

CallPickupAlertEventArgs Class

CallPickupAlertStatus Class

CallPrecedenceLevel Enumeration

CallPrecedenceLevelChangedEventArgs Class

CallPreemptedEventArgs Class

CallPreemptionReason Enumeration

CallRecordingActionType Enumeration

CallRecordingState Enumeration

CallRecordingStateChangedEventArgs Class

CallSecureIndicationChangedEventArgs Class

CallService Class

CallState Enumeration

CallType Enumeration

CameraControl Enumeration

CancellableDataRetrieval Class

Capability Class

CapabilityDenialReason Enumeration

CertificateEnrollmentResult Enumeration

CertificateExpiryEventArgs Class

CertificateManager Class

CertificateManager.CertificateEnrollmentCompletionHandler Delegate

CertificateManager.CertificateValidatorCompletionHandler Delegate

CertificateStoreException Class

CertificateStoreResult Enumeration

CertificateValidationException Class

CertificateValidationResult Enumeration

CesConfiguration Class

Challenge Class

Challenge.AuthorizationMethod Enumeration

Chat Class

Chat.ParticipantsCompletionHandler Delegate

Chat.SendMessageCompletionHandler Delegate

ChatError Enumeration

ChatFailureEventArgs Class

ChatMessage Class

ChatMessageEventArgs Class

ChatMessageStatus Enumeration

Circle Class

Client Class

Client.CreateUserCompletionHandler Delegate

ClientConfiguration Class

Collaboration Class

Collaboration.CollaborationCompletionHandler Delegate

Collaboration.GetParticipantsCompletionHandler Delegate

Collaboration.ReadCollaborationDetailsCompletionHandler Delegate

Collaboration.ReceivingSharingControlCompletionHandler Delegate

CollaborationCapabilities Class

CollaborationContentSharingEventArgs Class

CollaborationContentSharingMode Enumeration

CollaborationDetails Class

CollaborationEventArgs Class

CollaborationFailureEventArgs Class

CollaborationLibrarySharingEventArgs Class

CollaborationParticipantsEventArgs Class

CollaborationReceiveStatistics Class

CollaborationRenderType Enumeration

CollaborationService Class

CollaborationService.CollaborationServiceCompletionHandler Delegate

CollaborationStatistics Class

CollaborationStatus Enumeration

CollaborationWhiteboardEventArgs Class

Conference Class

Conference.ConferenceActionCompletionHandler Delegate

Conference.ConferenceActionCompletionHandlerWithStringResult Delegate

ConferenceConfiguration Class

ConferenceConnectionError Enumeration

ConferenceConnectionFailureEventArgs Class

ConferenceEncryptionStatus Enumeration

ConferenceEncryptionStatusEventArg Class

ConferenceEndTimeEventArg Class

ConferenceMobileLink Class

ConferenceMobileLink.MobileLinkActionCompletionHandler Delegate

ConferenceMobileLinkConnectedEventArgs Class

ConferenceMobileLinkConnectionStatus Enumeration

ConferenceMobileLinkDiscoveryWatcher Class

ConferenceNewSlideEventArg Class

ConferencePropertyEventArgs Class

ConferenceRecordingStatus Enumeration

ConferenceRecordingStatusEventArg Class

ConferenceRoomSystemInformation Class

ConferenceRoomSystemStatus Enumeration

ConferenceSlide Class

ConferenceSlideViewer Class

ConferenceSlideViewer.ConferenceSlideViewerSubscriptionCompletionHandler Delegate

ConferenceSlideViewer.ConferenceSlideViewerUnsubscriptionCompletionHandler Delegate

ConferenceStatusChangedEventArgs Class

ConferenceStreamingStatus Enumeration

ConferenceStreamingStatusEventArg Class

ConnectionPolicy Class

Contact Class

Contact.ContactPresenceCompletionHandler Delegate

Contact.RetrievePictureCompletionHandler Delegate

ContactBoolField Class

ContactChangedEventArgs Class

ContactDoubleField Class

ContactEmailAddressField Class

ContactEmailAddressType Enumeration

ContactEmailFieldList Class

ContactError Enumeration

ContactErrorEventArgs Class

ContactException Class

ContactField Class

ContactGroup Class

ContactGroup.ContactGroupOperationCompletionHandler Delegate

ContactGroupRetrievalWatcher Class

ContactGroupsLoadingErrorEventArgs Class

ContactIMAddressField Class

ContactIMAddressFieldList Class

ContactLimits Class

ContactListEventArgs Class

ContactMultiValueField<Avaya::ClientServices::ContactEmailAddressField ^> Class

ContactMultiValueField<Avaya::ClientServices::ContactIMAddressField ^> Class

ContactMultiValueField<Avaya::ClientServices::ContactPhoneField ^> Class

ContactMultiValueField<Avaya::ClientServices::ContactStringField ^> Class

ContactPhoneField Class

ContactPhoneFieldList Class

ContactPhoneNumberType Enumeration

ContactPresenceChangedEventArgs Class

ContactRetrievalWatcher Class

ContactSearchRequest Class

ContactService Class

ContactService.AddContactCompletionHandler Delegate

ContactService.ContactActionCompletionHandler Delegate

ContactService.CreateContactGroupCompletionHandler Delegate

ContactService.DeleteContactGroupCompletionHandler Delegate

ContactService.GetSelfContactCompletionHandler Delegate

ContactService.UpdateContactCompletionHandler Delegate

ContactServiceErrorEventArgs Class

ContactServiceFailureReason Enumeration

ContactsLoadingErrorEventArgs Class

ContactsLoadingEventArgs Class

ContactSourceType Enumeration

ContactsServiceFailedEventArgs Class

ContactStringField Class

ContactStringFieldList Class

ContentSharing Class

ContentSharing.ContentSharingCompletionHandler Delegate

ContentSharing.RemoteControlCompletionHandler Delegate

ContentSharing.RemoteControlParticipantsCompletionHandler Delegate

ContentSharingCanvas Class

ContentSharingCapabilities Class

ContentSharingCursorEventArgs Class

ContentSharingEventArgs Class

ContentSharingFrameEventArgs Class

ContentSharingRectEventArgs Class

ControllableEndpoint Class

ControllableEndpointsUpdatedEventArgs Class

ControllingEndpoint Class

Conversation Class

Conversation.AddParticipantAddressesCompletionHandler Delegate

Conversation.CompletionHandler Delegate

ConversationRetrievalWatcher Class

ConversationStatus Enumeration

ConversationTimeEventArgs Class

ConversationType Enumeration

CredentialCallback Delegate

CrisisAlert Class

CustomizedButton Class

DataCollectionChangedEventArgs(T) Class

DataCollectionChangeType Enumeration

DataRetrievalEventArgs(T) Class

DataRetrievalStatus Enumeration

DataRetrievalWatcher(T, E) Class

DataSharingMode Enumeration

DataTransferOptionalParameters Class

DataTransferResultArgs Class

DataTransferService Class

DataTransferService.DataTransferCompletionHandler Delegate

DataTransferService.DataTransferWithDataCompletionHandler(T) Delegate

DataTransferServiceConfiguration Class

DataTransferServiceError Enumeration

DataTransferServiceErrorEventArgs Class

DenialReason Enumeration

DialingRulesConfiguration Class

DirectorySearchError Enumeration

DirectorySearchFailureEventArgs Class

DownloadOptionalParameters Class

DownloadResultArgs Class

DownloadService Class

DownloadService.DownloadCompletionHandler(T) Delegate

DownloadService.DownloadWithParametersCompletionHandler(T) Delegate

DownloadServiceConfiguration Class

DownloadServiceError Enumeration

DownloadServiceErrorEventArgs Class

DownloadWatcher Class

DroppedParticipant Class

DroppedParticipant.ParticipantActionCompletionHandler Delegate

DtmfTone Enumeration

Ec500Configuration Class

EditableContact Class

EditableContact.RetrievePictureCompletionHandler Delegate

EditableContactBoolField Class

EditableContactDoubleField Class

EditableContactEmailAddressField Class

EditableContactEmailFieldList Class

EditableContactIMAddressField Class

EditableContactIMAddressFieldList Class

EditableContactMultiValueField<Avaya::ClientServices::EditableContactEmailAddressField ^> Class

EditableContactMultiValueField<Avaya::ClientServices::EditableContactIMAddressField ^> Class

EditableContactMultiValueField<Avaya::ClientServices::EditableContactPhoneField ^> Class

EditableContactMultiValueField<Avaya::ClientServices::EditableContactStringField ^> Class

EditableContactPhoneField Class

EditableContactPhoneFieldList Class

EditableContactStringField Class

EditableContactStringFieldList Class

EnhancedCallForwardingFeatureEventArgs Class

EnhancedCallForwardingStatus Class

EnrollmentCredential Class

EnrollmentCredentialCallback Delegate

etSharingApplicationWindowState Enumeration

ExportChatEventArgs Class

ExportMessagingConversationEventArgs Class

ExportService Class

ExportService.ExportChatCompletionHandler Delegate

ExportService.ExportMessagingConversationCompletionHandler Delegate

ExportStatus Enumeration

ExtensionToggleFeatureEventArgs Class

ExtraFieldKey Class

ExtraPropertiesEventArgs Class

FailbackPolicy Enumeration

FeatureAction Enumeration

FeatureException Class

FeatureFailureReason Enumeration

FeatureInvocation Class

FeatureInvocationParameters Class

FeatureLabelError Enumeration

FeatureLabelErrorEventArgs Class

FeatureParameters Class

FeatureStatus Enumeration

FeatureStatusEventArgs Class

FeatureStatusParameters Class

FeatureType Enumeration

FeatureTypeEventArgs Class

ForwardingFeatureEventArgs Class

ForwardingOverride Enumeration

HIDButtonPressEventArg Class

HIDButtonType Enumeration

HIDDeviceConnectionStatus Enumeration

HIDDeviceConnectionStatusEventArgs Class

HIDService Class

HttpClientConfiguration Class

HttpUserConfiguration Class

ICredentialProvider Interface

IEnrollmentCredentialProvider Interface

IncomingVideoStatus Enumeration

IntegerEventArgs Class

IPOfficeConfiguration Class

JoinStatus Enumeration

Layer2PriorityMarking Enumeration

LdapConfiguration Class

LdapDirectoryType Enumeration

LdapScopeType Enumeration

LeaveConversationResponse Class

LeaveConversationsWatcher Class

LibraryDocument Class

LibraryDocumentType Enumeration

LibraryDocumentUploadEventArgs Class

LibraryManager Class

LibraryManager.LibraryManagerCancelUploadDocumentHandler Delegate

LibraryManager.LibraryManagerDeleteDocumentHandler Delegate

LibraryManager.LibraryManagerGetContentHandler Delegate

LibraryManager.LibraryManagerGetDocumentHandler Delegate

LibraryManager.LibraryManagerGetUploadDocumentProgressHandler Delegate

LibraryManager.LibraryManagerRenameDocumentHandler Delegate

LibraryManager.LibraryManagerUploadDocumentHandler Delegate

LibraryManagerUploadProgress Class

LibraryManagerUploadProgress.DocumentUploadProgressType Enumeration

LibrarySharing Class

LibrarySharing.LibrarySharingCompletionHandler Delegate

LibrarySharingDocumentEventArgs Class

LibrarySharingPageContentEventArgs Class

LineAppearance Class

ListEventArgs(T) Class

LocalContactConfiguration Class

LocalizedStringIdentifier Enumeration

LogLevel Enumeration

LogMessageEventArgs Class

MaxSupportedVideoResolutionsCapability Class

MediaAddressMode Enumeration

MediaConfiguration Class

MediaDirection Enumeration

MediaEncryptionType Enumeration

MediaTransportPreference Enumeration

MeetingMediaType Enumeration

MeetingMinuteEventArgs Class

MeetingMinutes Class

MeetingMinutes.MeetingMinutesCompletionHandler Delegate

Message Class

Message.CompletionHandler Delegate

Message.MessageCompletionHandler Delegate

Message.MessageDeliveryDetailsCompletionHandler Delegate

MessageBodyPart Class

MessageBodyPartEventArgs Class

MessageDeliveryDetails Class

MessageDeliveryState Enumeration

MessageImportance Enumeration

MessageListEventArgs Class

MessageReadState Enumeration

MessageRetrievalWatcher Class

MessageStatus Enumeration

MessageTimeEventArgs Class

MessageType Enumeration

MessagingCancelEventArgs Class

MessagingConfiguration Class

MessagingConversationNumberEventArgs Class

MessagingDisplayOrder Enumeration

MessagingError Enumeration

MessagingFailureEventArgs Class

MessagingLimits Class

MessagingParticipant Class

MessagingParticipant.RetrievePictureCompletionHandler Delegate

MessagingParticipantListEventArgs Class

MessagingParticipantPhoneNumber Class

MessagingParticipantPhoneNumberType Enumeration

MessagingParticipantSourceType Enumeration

MessagingParticipantType Enumeration

MessagingProviderConversationsEventArgs Class

MessagingProviderFailureEventArgs Class

MessagingProviderLimitsEventArgs Class

MessagingProviderNumberEventArgs Class

MessagingProviderRemoveConversationEventArgs Class

MessagingProviderRoutableDomainsEventArgs Class

MessagingProviderType Enumeration

MessagingProviderTypeEventArgs Class

MessagingQuery Structure

MessagingReasonType Enumeration

MessagingService Class

MessagingService.CompletionHandler Delegate

MinuteMessage Class

MinuteStatus Enumeration

MinuteType Enumeration

MissedCallReason Enumeration

Modality Enumeration

OpusFormatProfile Enumeration

OtherPhoneActivationFailureException Class

OtherPhoneService Class

OtherPhoneService.OtherPhoneServiceCompletionHandler Delegate

OtherPhoneServiceError Enumeration

OutboundSubscriptionConfiguration Class

OverloadStatus Enumeration

Participant Class

Participant.SendMessageCompletionHandler Delegate

ParticipantConnectionStatus Enumeration

ParticipantEventArgs Class

ParticipantMediaEventArgs Class

ParticipantMediaStatus Enumeration

PendingLogoutReason Enumeration

PendingParticipant Class

PendingParticipant.ParticipantActionCompletionHandler Delegate

PendingParticipantAdmissionCancellationReasonCode Enumeration

PendingParticipantCancelledEventArgs Class

PpmConfiguration Class

Presence Class

PresenceAccessControlList Class

PresenceAccessControlList.PresenceWatcherCompletionHandler Delegate

PresenceAccessControlListPolicy Enumeration

PresenceAccessControlPolicyEventArgs Class

PresenceAccessControlRulesEventArgs Class

PresenceConfiguration Class

PresenceError Enumeration

PresenceEventArgs Class

PresenceFailureEventArgs Class

PresenceListSubscription Class

PresenceLocationMode Enumeration

PresenceOptions Enumeration

PresencePublishFailureEventArgs Class

PresenceService Class

PresenceState Enumeration

PresenceWatcher Class

PresenceWatcherRequestEventArgs Class

ProtocolEventArgs Class

ProtocolException Class

ProviderSourceType Enumeration

ProxyMode Enumeration

QueueStatistics Class

ReasonCodeLength Enumeration

ReasonCodeMode Enumeration

RecipientMessageState Enumeration

RefreshType Enumeration

RegistrationError Enumeration

RegistrationFailureEventArgs Class

RegistrationGroup Class

ReloadRequestEventArgs Class

ReloadRequestType Enumeration

RemoteAddressChangedEventArgs Class

RemoteAlertingEventArgs Class

RemoteControlSessionDisconnectEventArgs Class

RemoteControlSessionEventArgs Class

ResolveContactsRequest Class

ResolveContactsScopeType Enumeration

ResourceDiscoveryEventArgs Class

ResourceDiscoveryItemType Enumeration

RingPattern Enumeration

RingType Enumeration

ScepConfiguration Class

SearchContactsWatcher Class

SearchConversation Class

SearchConversationsWatcher Class

SearchScopeType Enumeration

SearchSourceType Enumeration

SearchTerminalsRequest Class

SearchTerminalsWatcher Class

SecurityPolicy Enumeration

SecurityPolicyConfiguration Class

SelfContactEventArgs Class

SendSlideEventArgs Class

SensitivityLevel Enumeration

ServerInfo Class

ServiceObservingError Enumeration

ServiceObservingErrorEventArgs Class

ServiceObservingEventArgs Class

ServiceObservingMode Enumeration

ServiceObservingStatusParameters Class

ServiceObservingType Enumeration

ServiceStatus Class

ServiceStatus.DisabledReasons Enumeration

SettingsFileParser Class

SettingsFileParser.GetSettingsFileVariable Delegate

SettingsFileParser.OnAdditionalSettingsFileRequested Delegate

SettingsFileParser.SetSettingsFileVariable Delegate

Shape Class

ShapeStatus Enumeration

SharedControlCompletionHandlerEventArgs Class

SharedControlDisconnectReason Enumeration

SharedControlService Class

SharedControlService.SharedControlActionCompletionHandler Delegate

SharedControlSessionConnectEventArgs Class

SharedControlSessionEventArgs Class

SharingApplicationWindow Class

SharingApplicationWindowStateChangedEventArgs Class

SharingDisplay Class

SignalingAddressMode Enumeration

SignalingEnvironment Enumeration

SignalingPingConfiguration Class

SignalingServer Class

SignalingServerEventArgs Class

SignalingServerGroup Class

SignalingServerGroupEventArgs Class

SipAgentConfiguration Class

SipClientConfiguration Class

SipUserConfiguration Class

SliderSlide.FetchImageCompletionHandler Delegate

SliderSlidesEventArgs Class

StartCallRequestEventArgs Class

StatisticsData Class

StatisticsDataEventArgs Class

StatisticsDataResourceType Enumeration

StringEventArg Class

StringEventArgs Class

StringListEventArgs Class

SupervisorCallType Enumeration

TeamButton Class

TeamButton.FeatureCompletionHandler Delegate

TeamButton.FeatureLabelCompletionHandler Delegate

TeamButtonIncomingCall Class

TeamButtonIncomingCall.FeatureCompletionHandler Delegate

TeamButtonIncomingCallEventArgs Class

Terminal Class

TLSProtocolVersion Enumeration

ToggleFeatureEventArgs Class

TransferStatus Enumeration

TransferStatusEventArgs Class

TransportType Enumeration

TrustStoreMode Enumeration

UnifiedPortalConferencingConfiguration Class

UnifiedPortalConfiguration Class

UnifiedPortalError Enumeration

UnifiedPortalErrorEventArgs Class

UnifiedPortalMeetingInfo Class

UnifiedPortalResources Class

UnifiedPortalService Class

UnifiedPortalService.GetPortalUserTokenCompletionHandler Delegate

UnifiedPortalService.GetResourcesCompletionHandler Delegate

UnifiedPortalService.RequestToJoinMeetingCompletionHandler Delegate

UnifiedPortalService.SendClientInfoCompletionHandler Delegate

UpdateContactEventArgs Class

User Class

UserConfiguration Class

UserCreatedException Class

UserCreatedFailureReason Enumeration

UserCredential Class

UserEventArgs Class

UserToUserInformation Class

VideoChannel Class

VideoChannelEventArgs Class

VideoChannelFailureEventArgs Class

VideoChannelReceiveStatusEventArgs Class

VideoChannelsEventArgs Class

VideoChannelsFailureEventArgs Class

VideoConfiguration Class

VideoDetails Class

VideoDisabledReason Enumeration

VideoLayoutEventArgs Class

VideoLayoutsEventArgs Class

VideoLayoutType Enumeration

VideoMode Enumeration

VideoModeEventArgs Class

VideoResolutionCapability Class

VideoResolutionForMainVideoStreaming Enumeration

VideoResolutionForMultiVideoStreaming Enumeration

VideoResolutionPreferenceForMainVideoStreaming Class

VideoResolutionPreferenceForMultiVideoStreaming Class

VideoStatistics Class

VideoTransmitStatistics Class

VideoUserConfiguration Class

VirtualRoom Class

VisualVoiceMailError Enumeration

VisualVoiceMailFailureEventArgs Class

VisualVoiceMailFileDownloadStatus Enumeration

VisualVoiceMailMessage Class

VisualVoiceMailMessage.CompletionHandler Delegate

VisualVoiceMailMessagesEventArgs Class

VisualVoiceMailRetrievalWatcher Class

VisualVoiceMailService Class

VisualVoiceMailService.CompletionHandler Delegate

VoiceMessagingService Class

VoiceMessagingStatus Class

VoiceMessagingStatusEventArgs Class

WcsConfiguration Class

Whiteboard Class

Whiteboard.WhiteboardCompletionHandler Delegate

WhiteboardCanvas Class

WhiteboardEventArgs Class

WhiteboardShapeEventArgs Class

WhiteboardSurface Class

WhiteboardSurface.WhiteboardCompletionHandler Delegate

WhiteboardSurface.WhiteboardSurfaceCompletionHandler Delegate

WhiteboardText Class

WhiteboardTool Enumeration

WhiteboardUserEventArgs Class

ZangConfiguration Class

ConferenceConferenceActionCompletionHandlerWithStringResult Delegate

Defines the delegate used as the completion handler for requests on the Conference object that return a string as the result.

Namespace: Avaya.ClientServices
Assembly: AvayaClientServices (in AvayaClientServices.dll) Version: 493.0.70.0

Syntax

Copy

public delegate void ConferenceActionCompletionHandlerWithStringResult(
	string result,
	CallFailureException error
)

Parameters

result: Type: SystemString
If the request is successful, this argument will contain the result of the operation, otherwise it will be null.
error: Type: Avaya.ClientServicesCallFailureException
If the request is successful, this argument will be null. Otherwise the request has failed and the argument represents the error associated with request.

Reference

Avaya.ClientServices Namespace