I am facing below issue for Nokia X1, C1 models in my network:
1.) A calls B and then B moves to another cell and A disconnect the call. Afterwards A is not able to make or receive the call, getting Assignment Failure at MSC & Assignment failure at BSC with RR Cause: Conditional Information Element Error.
Later if switch off & switch on the handset then there is no problem.
Pls revert if anyone facing the same issue in there network or any idea about it.