If you enter a landline in the sample

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However, the voice channel can be used for toll fraud . Therefore, unless you detect a landline or have a business scenario for calls, we recommend not exposing this channel until the third or fourth SMS attempt or disabling it altogether. Show a “Call me instead” option in your user experience after multiple SMS attempts have been made: One-time passcode entry field with grayed-out code return message and clickable link saying "Problem receiving SMS, call me instead" Detect landlines In addition to using Twilio's Lookup API to detect invalid phone numbers, you can use the API to detect landline numbers and use the channel call for those numbers instead of the default SMS sending.

If you enter a landline in the sample project, it will call automatically instead of sending the verification code via SMS. One-time passcode entry field with message saying "landline detected. call verification sent" Disable philippines whatsapp number unused channels in the Twilio console If you want to disable certain channels, you can do so in the Verify section of the Twilio console . Twilio Verify console showing disabled buttons for call and email channels Implement reCAPTCHA for voice calls Implement reCAPTCHA to help detect and prevent bots in your verification flow. To learn more about implementing this feature, see Google's developer documentation .



Adding additional rate limits The Twilio Verify API supports programmable rate limits that you can apply to particular segments based on request, such as IP address, geolocation, or country code. General Best Practices for User Verification Retry logic is one component of creating a smooth user verification workflow. Here are some other best practices: 1. Use Twilio's Lookup API to detect invalid numbers and line type before sending a check In addition to using the Carrier Lookup API to identify landlines , the Lookup API can be used to identify invalid numbers before attempting to send a verification code.