SIP 603 Decline Error
The 603 Decline error in SIP means that the call was rejected by the destination. This indicates that the connection reached the recipient, but the call was not accepted. This issue is not related to the softphone itself.
Main Causes of 603 Decline
- The recipient manually rejected the call
- The device is configured to automatically decline calls
- Provider-side policies or restrictions
- Insufficient account balance in some cases
- Other recipient-side conditions
How to Fix the 603 Decline Error
- Ensure the recipient is available to answer the call
- Try calling again later
- Check account balance if applicable
- Ask the recipient about the reason for rejection
- Contact your VoIP provider for further details
The SIP 603 Decline error means the call was intentionally rejected by the recipient. In most cases, no technical fix is required, as the issue is related to user action or recipient-side settings.