Twilio SIP Products Interface TLS 1.0/1.1 End of Life, Effective May 5, 2025

Starting May 5, 2025, Twilio will officially end support for TLS 1.0 and TLS 1.1 protocols on Elastic SIP Trunking and Programmable Voice SIP interfaces. As part of Twilio's commitment to security, this change aligns with industry standards to prevent vulnerabilities associated with older TLS protocols.

To avoid disruptions, customers using TLS 1.0 or 1.1 for SIP connections with Twilio should refer to their SIP vendor’s documentation to update to TLS 1.2 or higher by May 5, 2025. Connections over TLS 1.0 or 1.1 after this date will fail, leading to potential call setup issues.

To ensure continued connectivity and avoid disruptions, customers should do two things before May 5, 2025:

• Refer to your SIP vendor’s documentation to upgrade to TLS 1.2: Customers must configure their SIP infrastructure—including IP-PBX, SBCs, and SIP phones—to use TLS 1.2 for all connections to Twilio. 
• Verify Your Setup: After updating, follow these steps to confirm your setup:
  • Log in to the Twilio Console.
  • Go to Voice > Settings > General.
  • Locate "Allow Deprecated SIP/TLS Versions" and click "Disabled".
  • Click "Save" and test your system to ensure continued connectivity for voice calls.