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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.
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.
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.
To resolve Error 13218, follow these actionable steps:
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
.
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'
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.
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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