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Twilio Voice Error 13218 encountered during call setup.

Invalid 'To' phone number.

Understanding Twilio Voice API

Twilio Voice API is a powerful tool that allows developers to make, receive, and monitor phone calls programmatically. It is widely used in applications that require voice communication capabilities, such as customer support systems, automated call centers, and more. With Twilio, developers can integrate voice functionalities into their applications with ease, leveraging its robust infrastructure and global reach.

Identifying the Symptom: Error 13218

When working with Twilio Voice API, you might encounter the error code 13218. This error typically arises during the call setup process and indicates an issue with the phone number being dialed. The error message usually states that the 'To' phone number is invalid, preventing the call from being completed successfully.

Exploring the Issue: What is Error 13218?

Error 13218 is specifically related to the validation of the 'To' phone number in your API request. Twilio requires that all phone numbers be in a valid format and adhere to the E.164 standard, which includes the country code and the subscriber number. An invalid phone number format or a number that does not exist can trigger this error.

Common Causes of Error 13218

  • Missing country code in the phone number.
  • Incorrect number format or length.
  • Non-existent or unreachable phone number.

Steps to Resolve Error 13218

To resolve Error 13218, follow these actionable steps:

Step 1: Validate the Phone Number Format

Ensure that the phone number is in the correct E.164 format. This format includes a '+' sign followed by the country code and the subscriber number. For example, a US number should look like +14155552671.

Step 2: Check the Number's Validity

Use Twilio's Lookup API to verify the validity of the phone number. This API can help determine if the number is reachable and correctly formatted.

curl -X GET 'https://lookups.twilio.com/v1/PhoneNumbers/+14155552671?Type=carrier' \
--user 'ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:your_auth_token'

Step 3: Update the Phone Number

If the number is invalid, update it in your application or database to ensure it meets the required format and is a valid, reachable number.

Additional Resources

For more information on handling phone numbers with Twilio, visit the Twilio Voice Documentation and the Twilio Lookup API Documentation.

By following these steps, you can effectively resolve Error 13218 and ensure smooth operation of your Twilio Voice API integration.

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