Issue
Twilio customers may encounter error 32203 (“Call blocked by Twilio”) when attempting to place outbound calls to phone numbers in Iran. This article explains why this occurs, what it means, and what options are available.
Symptoms
- Outbound calls to Iranian numbers (country code +98) fail with error 32203.
- The error message may state: “SIP: Call blocked by Twilio.”
- The destination number is legitimate and not fraudulent.
- Your Primary Customer Profile in Trust Hub is approved.
Product
Programmable Voice
Environment
Twilio Console
Cause
Twilio’s current policies do not permit outbound voice calls to Iran. This restriction is in place due to regulatory and compliance requirements. As a result, all outbound calls to Iranian destinations are automatically blocked, regardless of your account status or Trust Hub approval.
Resolution
-
No Override Possible:
Twilio cannot remove the block or make exceptions for outbound calls to Iran. This restriction applies to all Twilio customers. -
Other Destinations:
Outbound calls to other countries may be permitted, subject to Twilio’s policies and compliance checks. If you experience issues with other destinations, gather call examples and check your Trust Hub status.
Example Scenario
A customer with an approved Trust Hub profile attempted to call a legitimate Iranian number and received error 32203. After investigation and escalation, Twilio Support confirmed that calls to Iran are not permitted by Twilio policy, and the block could not be removed.
Additional Information
If you receive error 32203 when calling Iran, this is due to Twilio’s policy restrictions. Outbound calls to Iran are not supported, and the block cannot be lifted. For questions about other destinations, review your Trust Hub status and contact Twilio for further guidance.
Below you will find references to useful documents: