31603: Decline

Use this to detect that the callee declined the call. In SIP termination flows, Twilio can also return 603 Decline when the account is not active.

• The callee rejected the call and returned 603 Decline.
• Twilio received SIP termination traffic for an account that is not active, which can happen when the account is closed or suspended because of lack of funds or a Terms of Service or Acceptable Use Policy violation.

• Treat the response as a declined-call outcome in your application.
• If the decline happens on SIP termination traffic, check that the Twilio account is active, refill funds if needed, or contact Twilio Customer Support if the account is closed or suspended.
• When Twilio returns 603 Decline for an inactive account, inspect the X-Twilio-Error header for Error 10001.

• Error and Warning Dictionary
• Troubleshooting your Trunk
• Voice SDK Error Codes