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Cisco Bug: CSCvv57424 - SGd MT-Forward-Short-Message-Request handling when the req is received outside PTW is wrong

Last Modified

Oct 08, 2020

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

21.17.2.74219

Description (partial)

Symptom:
The MME answer with Absent Subscriber if the NBIoT device is paged (and does not answer paging) after going to idle mode, but before entering PSM (T3324 used was 30 seconds).
If the NBIoT device is in PSM mode, the MME does not page the device (as expected), but does not answer with Absent Subscriber in the Sgd. 
After 30 seconds the MME answers back with DIAMETER_ERROR_SM_DELIVERY_FAILURE with cause EQUIPMENT_PROTOCOL_ERROR.

Conditions:
SGd interface configured and enabled.
NBIoT device.
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