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Reply To: CM Service Abort


Hi ,


I have Ur case too. No reasons are found on the decoded frames.


In the decoded signal that the MSC sent, this one support A5/1, A5/2 and A5/3. Our BSC support only two mode : A5/1 and A5/2.
In some cases, the MS send the ‘ Classmark Update’ before the ‘CM service Abort’. I decode one of theses cases and see that the MS support the 3 cipher mode.

For the information, no one have tried to deactivate ciphering.