Hi Peyo,
We have enough SD on each cell to support the SD traffic. So normaly we should not have SD block. But all the cells connected to these BSCs which are connected to the MGW are having high SD congestion. We have another MGW which are connected to the MSC but don’t have this problem. The problem appears when the MGW accessibility get low (Under the threshold 99.7%). There is not alarm showing equipment problem on the MGW.