> For a complete index of all SignalWire documentation pages, fetch https://signalwire.com/docs/llms.txt # Error codes The API defines error codes to convey information about possible issues. Below is a list of all error codes as well as possible causes for the error code to appear. ## Errors * The provided list of capabilities contains invalid capabilities for the phone number * The capabilities for the phone number are missing - The fee for the operation you are trying to perform costs more than the available balance * The argument passed is invalid * An attempt was made to cancel an in-progress call * An attempt was made to update a completed call * An attempt was made to update a conference or conference participant for a completed conference * An attempt was made to cancel an in-progress or finished fax * A required argument was left blank * An attempt was made to redact a message that is still in-progress - The operation attempted is not enabled on the Space * The permissions passed for the API token contain invalid selections - The subproject ID passed does not belong to the project used to authenticate the request * The URL passed to update the queue member is invalid - The attempt to deliver a webhook to your server timed out * DNS resolution failure due to bad hostname - Redirected too many times * The attempt to deliver a webhook to your server responded with a 4xx or 5xx status code - An error occurred during the SSL/TLS handshake * There was a fatal protocol violation - HTTP version not supported * The provided response body is too large - The total size of the media message request exceeds the maximum size limit * Your CXML document failed to parse. There could be a leading space, a missing or unclosed element, or incorrect attribute - The content type of the provided URL is invalid * The HTTP method attribute is invalid - it can only be 'GET' or 'POST' - The attribute in sendDigits includes an invalid character. It may only contain '0123456789ABCD\*#wW' * The provided event is not a valid recording callback event - The provided trim value for the recording is invalid * The provided conference attributes are invalid * The required conference attributes are missing * The participant to be coached is not in the provided conference - An unknown error occurred * The friendly name is missing * The friendly name must be between 1 and 64 characters long * The friendly name is invalid - There was an authentication error or API access is blocked for this feature * An attempt was made to delete a call that is not finished * An attempt was made to delete a fax that is not finished * An attempt was made to delete a message that is in-progress * An attempt was made to delete media for a message that is in-progress - The action you are attempting to perform is disabled for the account * The resource you are trying to access does not exist - The passed document is not a valid CXML document. The CXML document is missing a content type header or contains an invalid parameter/value * There were too many requests or throughput was exceeded - An internal error occurred * A phone call was attempted without a CXML URL or ApplicationSid - The provided Timeout parameter was invalid - The provided Timeout parameter was not a positive whole integer * The Method parameter provided was not GET or POST * The passed mode was not valid for the phone number - The From number provided was not a purchased or verified number in your project - The From number provided was not a purchased number in your project - An outbound message was attempted where the From number provided was a verified caller ID * The 'To' number provided was missing * The 'To' number provided has an invalid format - The From number provided was not E164 while dialing to a phone number - The From number provided must be an E164 number, caller ID string, or SIP URI - The From number provided must be an E164 number or client identifier - The From number provided has invalid format * An outbound call was attempted without a From number - The To phone number provided does not appear to be valid * The provided ApplicationSid is invalid * The provided ApplicationSid does not exist - The account limitations for this feature have been exceeded - The 'To' phone number is not a verified caller ID and the account is in Trial mode - The 'To' phone number is not a verified caller ID as required for Platform Free Trial messaging * The call cannot be redirected if it is not in-progress * A stream cannot be started for a call or conference in the current state * A recording cannot be started for a call that is not in-progress - The AMD parameters provided are not valid * The AMD status callback URL is missing - The phone number you're attempting to purchase has an invalid format * The URL is not valid * The URL is not a fully qualified URL - The callback URL is not set * The passed VoiceApplicationSid or SmsApplicationSid could not be found - An area code or number must be provided to purchase a number * The area code is not formatted correctly - The supplied callback URL is not valid * An attempt was made to update a conference with an invalid status - The page token supplied was invalid * The phone number is not a valid SMS or MMS capable number * The phone number is not a voice capable number * The phone number is not a fax capable number - An attempt was made to send a message without a media URL or text body * The format of the 'To' or 'From' is invalid * The 'From' number is missing * The 'To' number has invalid format * The 'To' number is missing - The 'To' number is required to send a message * The 'To' number provided is not a mobile number - The message was blocked by the user or sent from a blacklisted number * The 'From' number has exceeded the maximum number of queued calls, messages, or faxes for the account - The Media provided is not supported * The 'To' number is not a valid mobile number - The concatenated message body exceeds the allowed character limit * The media URL(s) provided is/was invalid * The URL must be HTTP or HTTPS - The number of media files exceeds the allowed limit * The validity period provided is invalid - The callback event is not valid * The E911 address provided is invalid for this phone number - The number group provided is invalid or unrecognized * The number group provided does not have a phone number in the group capable of the operation you are attempting - The message was attempted without a From number or Number Group * The 'From' number must belong to an active campaign - The E911 address ID provided is not valid * This number was purchased too recently to release - The validity period for the message was exceeded * The account balance is insufficient to send the message * The account balance is insufficient for the operation you are attempting - The message was attempted but the destination handset is not reachable * The message was attempted but blocked by the destination carrier - The message was attempted but the destination handset is unknown * The message could not be routed to the destination handset - The message was flagged as a carrier violation - The message was filtered due to disallowed content * The message failed due to an unknown upstream error - The message's validity period has expired at the carrier * The max price was exceeded by the cost of the message * The max price was exceeded by the cost of the call - MMS Sent: Expired, Rejected, Failed, or Not Supported * The US A2P 10DLC messaging rate limits were exceeded - The US A2P 10DLC T-Mobile Daily Message Limit was reached * The request resulted in a connection timeout - The websocket URL provided for the stream is invalid - The websocket URL schema is not WSS - The websocket URL has a trailing whitespace - The websocket URL has an embedded whitespace * The SIP domain dialed is not a registered endpoint - The PFT Campaign daily message cap has been met - The sole proprietor campaign daily message cap has been met * The redacted message body must be empty * An attempt to redact the message by passing a different body was made - The URL returned an HTTP redirect - The URL exceeded the max amount of HTTP redirects - There was an internal failure while attempting to process the media * The PageToken provided is invalid or missing * A PageToken must be included if your Page value is larger than 0 - The page size provided is invalid * The message could not be delivered to the carrier - The media could not be downloaded * The wildcard is invalid while searching for available numbers * The format for the argument provided is invalid * The supplied parameter is unsupported * The supplied parameter can only be used in combination with InRegion * The E911 address cannot be set on creation - update the record after it is created * The specified capability could not be restricted on purchase ## Warnings * The Conference noun cannot be mixed with Number nouns * The Conference noun can only be used once inside a Dial verb - The Dial noun has an invalid nested element - The only valid nested element for Dial is Number - The Dial noun includes too many nouns - The Refer noun has an invalid nested element - No verbs can be nested within Refer, and Refer cannot be nested in any other verbs * The phone number in Dial is not formatted correctly. It must be E164 * The phone number in Dial is missing * You are attempting to Dial something that is not a phone number - There was an invalid Verb provided in the CXML executed by the waitUrl, holdUrl, or announceUrl - The executed CXML contains Dial, Gather, Hangup, or Record - these are not allowed * The provided SIP URI is formatted incorrectly - The SIP URI provided for Dial -> SIP is missing - The SIP URI provided for Dial -> SIP is not a public IP address - The SIP URI provided for Dial -> SIP does not resolve * The URL provided for Play does not return audio * The URL provided for Play has an invalid content type - The verb provided is not currently supported by the API version or your Space * The Refer verb was used on a non SIP call leg - The queue name is too short - The queue is missing in the attempt to Enqueue * The outbound phone call request was missing a 'To' number - The URL given to Play is not valid * The SIP URI provided is invalid * The Refer verb contains an invalid SIP URI - The supplied codecs are unsupported or invalid