32017: PSTN: Carrier blocked call due to calling number (caller ID)

Carrier blocked call due to calling number (caller ID)

The calling number (caller ID) may be invalid or an operator's analytics may have scored the calling number with less than perfect reputation due to past calls.

Check the calling number to ensure valid according to the North American numbering plan. Work with the corresponding analytics vendor. Reach out to help@twilio.com if you need guidance.