Kamal!
1)You said “I have mentioned all below para of SGSN only…” But VLR PERIODIC CLEANING START TIME parametr concerns VLR only, isn’t it?
2)Is Detach Timer resets, if MS performs Periodic RA Updatig only when Detach Timer is running?
3)Can you do a tests with suspect Ericsson mobile – switch on, GPRS attach+IMSI attach and wait while IMSI detach will occurs (without establishment GPRS sessions and voice call). Is it occured in VLR only, SGSN only or both SGSN and VLR? Exact time expired after switch on?