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MAP: equipment Protocol Error

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MAP: equipment Protocol Error

I all,
We have a lot of "equipment Protocol Error" when receiving SMS.

In the links below there is a sample traces:

Please need help with this problem.

Thank you,

equipment Protocol Error

The SMSC while attempting to send MT SMS may receive this error. Ideally it should retry MTSMS after some configured time interval.

Equipment Protocol Error

I too encountered similar errors.
Even though we have retry from SMSC, some scenarios we see that all retries are failed with same errors. Resulting to bad user experience with not delivering this sms`s. Do we have any concrete reasons causing these ? Looking for some guidelines.