Access denied
Access Token expired or expiration date invalid
Active channel not found for task
Activity change rejected due to pending tasks
Authorization error, public error code in Flex product
Bad Gateway
Bad request error
Invalid certificate
Caller ID undefined
Call instance is undefined. Call might be active on a different device
Conversation is not available
Conversations SDK connection changed to invalid state
Conversation transfers is forbidden
Conversation transfers retrieving is forbidden
DownstreamServiceError error
Worker cannot kick themselves from task
Failed to accept reservation
Failed to add conversation event listener due to internal error
Failed to add email participant due to internal error
Failed to add external voice participant due to internal error
Failed to add voice event listener due to internal error
Failed to cancel voice task transfer due to internal error
Failed to complete reservation during task completion
Failed to create a conference
Failed to create outbound email task due to internal error
Failed to create conversation task reservation
Failed to create task due to internal error
Failed to create voice task reservation
Failed to disconnect call due to internal error
Failed to end conference due to internal error
Failed to end task due to internal error
Failed to fetch account configuration
Failed to fetch features
Failed to fetch features
Failed to get call by task - call might be active on different device
Failed to get conference data from task
Failed to get Flex instance SID from account configuration
Failed to get reservation after resuming the conversation
Failed to hold call
Failed to hold external participant due to internal error
Failed to hold participant due to internal error
Failed to hold worker participant due to internal error
Failed to initialize Conversations SDK
Failed to kick participant due to internal error
Failed to leave conversation due to internal error
Failed to monitor call due to internal error
Failed to pause conversation due to internal error
Failed to pause recording
Failed to peek conversation due to internal error
Failed to reject reservation due to internal error
Failed to remove email participant due to internal error
Failed to remove participant during task completion
Failed to resume conversation due to internal error
Failed to resume recording
Failed to retrieve conversation due to internal error
Failed to retrieve conversations user by identity
Failed to retrieve conversation transfer due to internal error
Failed to retrieve messages due to internal error
Failed to retrieve outbound email settings due to internal error
Failed to retrieve paused conversations due to internal error
Failed to retrieve task participants due to internal error
Failed to send message due to internal error
Failed to send typing indicator due to internal error
Failed to set activity
Failed to set activity due to pending reservations
Failed to set current worker attributes
Failed to set task attributes
Failed to set worker activity by the supervisor
Attributes not valid JSON
Failed to start conversation transfer due to internal error
Failed to start voice task transfer due to internal error
Failed to unhold call
Failed to unhold external participant due to internal error
Failed to unhold participant due to internal error
Failed to unhold worker participant due to internal error
Failed to update token on session
Failed to wrap-up reservation due to internal error
Parameter 'fromNumber' is required for outbound call. Provide it as a parameter or configure it in account configuration
Gateway Timeout
Inbound call is accepted, outbound call cancelled
Inbound call is pending, outbound call cancelled
No incoming call event received within 30 seconds
Internal Server Error
Invalid access token
Invalid parameter value received as argument
Invalid participantSid provided
Invalid response from public configuration endpoint
Function called in invalid state of the object
Cannot send empty message
Missing channelSid for task
Required parameter missing
Missing interactionSid for task
Not able to reach the server
No active recording to pause
No active recording to resume
No active transfer found for voice task
No audio input device available, outbound call cancelled
No conference SID found in task attributes
No conversationSid found for task
Resource was not found
Outbound calling is disabled in Flex account configuration
Outbound email workflow SID is not configured in Twilio Console nor provided in options
Outbound email queue SID is not configured in Twilio Console nor provided in options
Outbound email workflow SID is not configured in Twilio Console nor provided in options
Participant not found
PermissionDenied error
Service Unavailable
Supervisor is already monitoring the call for this task
Task is not an email task
Task is not a voice task
Task Queue SID is required for outbound call. Provide it as a parameter or configure it in account configuration
Task reservation not found or has invalid status
Taskrouter offline activity SID is not configured
Twilsock rate limit exceeded
The error we did not foreseen
The error which error code we could not identify
Unknown voice event name
Validation error, public error code in Flex product
Voice device not initialized
Voice reservation not found
Voice reservation not a live call
Voice task transfer already initiated
Worker cannot hold reservation - reservation must be a live call assigned to the worker
Worker cannot transfer voice task assigned to different worker
Worker cannot unhold reservation - reservation must be a live call assigned to the worker
Worker is not initialized
Worker is offline, outbound email task cancelled
Worker is offline, outbound call cancelled
Worker participant not found for provided task
Workflow SID is required for outbound call. Provide it as a parameter or configure it in account configuration
Enumeration of error codes that can be thrown by the Flex SDK.