5th May 2011 at 14:49 #66285
Basically the MSC is not able to page the MS. The unreachable MS are either off coverage or out of battery : those are the MS that could not detach properly from the network.
in order to avoid this “ghost” MS, have you tried decreasing the VLR purge timer ? try to set it to “2*T3212 + 10mn” or something like this.