Overview
The error "unknownSubscriber" occurs when a subscriber is not receiving SMS messages due to a mismatch between the SMSC address and the GT, causing the SRI-SM to be sent to the wrong HLR. This issue typically arises when the GT and SMSC address belong to different operators, leading to a routing error. The solution involves validating MNP data and ensuring correct routing configurations.
Information
Error Message: "unknownSubscriber"
Cause: The error occurs when there is a mismatch between the SMSC address and the GT, causing the SRI-SM to be sent to the wrong HLR, which does not recognize the MSISDN and returns the error.
Resolution Steps:
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Validate MNP Data:
- Confirm that the MSISDN is correctly provisioned in the MNP database.
- Ensure that the GT used in the SRI-SM matches the operator that owns the MSISDN.
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Verify Routing Configuration:
- Check the GT translation and routing rules to ensure they align with the Core's expected HLR point codes.
- Use the command
tp_walk mobNetworkNumberRangeto verify that both the SMSC address and GT are mapped to the correct operators.
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Monitor and Adjust Configurations:
- Enable and monitor traps for unknown or conflicting SMSC addresses.
- Adjust the configuration to ensure that the SRI-SM is routed to the correct HLR GT for the ported-out number.
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Verification:
- Test the SMS delivery to ensure that the messages are being routed correctly and the error no longer occurs.
Note: If the issue persists, further investigation into the routing and configuration settings may be required.
Frequently Asked Questions
- How do I know if this error applies to my situation?
- You'll see the error message "unknownSubscriber" when attempting to send SMS messages, indicating a routing issue between the SMSC address and the GT.
- What should I do if the error persists after following the resolution steps?
- If the error persists, verify the MNP data and routing configurations again, and ensure that the GT and SMSC address are correctly aligned. Contact support for further assistance if needed.
- How can I proactively detect similar issues in the future?
- Enable and monitor traps for unknown or conflicting SMSC addresses, and set up automated alerts to identify and address routing mismatches before they impact service.
Priyanka Bhotika
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