# 31603: Decline

Log Level: ERROR

## Description

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.

### Possible causes

* 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.

### Possible solutions

* 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.

#### Additional resources

* [Error and Warning Dictionary](/docs/api/errors)
* [Troubleshooting your Trunk](/docs/sip-trunking/troubleshooting)
* [Voice SDK Error Codes](/docs/voice/sdks/error-codes)