Hi,
I have the same pb, Abis traces shows SDCCH establishment failure mapped on LAU procedure, failing due to MS problem : no answer to Immediate Assignment. (300 failure in 80 minutes)
CSSR is degraded and it seems that there is no solution to identifie IMEI cause SD assignment procedure is stop.
If anyone has idea on how to identify such MS causing this pb, please let us know.
tx