When a message appears as Undelivered in the candidate’s conversation, all users with access to the Candidate Profile will be able to see that the message was undelivered. However, Paradox Admins/System Implementors will be able to view the error code associated with the undelivered message so that they can provide guidance to the client about how to move forward.

Error code display and link

Only Paradox Admins/System Implementors will be able to see details related to an error causing the message to not be delivered. 

To assist you in resolving these issues, a tool tip will inform you of the error, and the error code listed next to the Undelivered status will be a hyperlink to Twilio documentation about the error. Click this to view information in regards to this error.

Common errors and solutions

• Error 30003 – Unreachable Destination Handset
  • Description: The destination handset you are trying to reach is switched off or otherwise unavailable.
  • Possible Cause: The candidate’s device is switched off or does not have sufficient signal.
  • Possible Solution: Resend the message to see if this is a signal issue.
  • Twilio Documentation (for more causes and solutions)
     
• Error 30001 – Queue Overflow
  • Description: Paradox’s queue for sending messages was maxed or in the queue for too long and, therefore, failed to send.
  • Possible Cause: You attempted to send too many messages too quickly and your queue message overflowed or you sent all your messages through a single sender.
  • Possible Solution: Try using a Messaging Service with multiple senders and it will load the balance for you.
  • Twilio Documentation (for more causes and solutions)
     
• Error 30004 – Message Blocked
  • Description: The destination number you are trying to reach is blocked from receiving this message.
  • Possible Cause: The device you are trying to reach does not have sufficient signal or does not receive SMS.
  • Possible Solution: Resend the message to see if this is a signal issue.
  • Twilio Documentation (for more causes and solutions)
    • IMPORTANT NOTE: A blocked message, if it’s within an approved 10dlc campaign or short code service, will usually resolve itself within the next business day and continue to send normally.
       
• Error 30007 – Message Filtered
  • Description: Your message content was flagged as going against carrier guidelines and blocked by Twilio or the carrier.
  • Possible Cause: Your message was identified as spam or unwanted messaging by Twilio's message filtering system.
  • Possible Solution: Ensure your messaging use case complies with Twilio's Messaging Policy and Acceptable Use Policy.
  • Twilio Documentation (for more causes and solutions)
    • IMPORTANT NOTE: A filtered message, if it’s within an approved 10dlc campaign or short code service, will usually resolve itself within the next business day and continue to send normally.
       
• Error 30005 – Unknown Destination Handset
  • Description: The destination number you are trying to reach is unknown and may no longer exist.
  • Possible Cause: The device you are trying to reach is not on or does not have sufficient signal.
  • Possible Solution: Resend the message to see if this is a signal issue.
  • Twilio Documentation (for more causes and solutions)
     
• Error 1: Receiving server could not or would not accept mail to this recipient permanently
  • Cause: The user’s email inbox is out of storage space and, therefore, cannot receive this email.
  • Solution: The user will need to delete some emails in their inbox in order to have the space to receive Paradox comms. It is recommended to send the user this Google help document to assist them in this process.

Additional error codes

If you find an error code that is outside of the above, you can search for that specific error in Twilio's help site to find its cause and solution.