Product: Programmable Voice
ERROR - 21216
API: Call blocked by Twilio blocklist
The destination number is blocked by Twilio because it either has a high-risk of fraud or, for regulatory reasons, cannot be enabled by default.
If you have a legitimate need to call this number, please email firstname.lastname@example.org with an explanation of your use case.
The phone number dialed is on the Twilio blocklist
Change the number dialed or reach out to Twilio for an exception