My Dear Ali
It is OK that BTS assigns a SDCCH in response to the Ghost RACH.Then what happens??Who sends the SABM??Nobody.Does BTS sends UA??No.
BTS waits till its T3101 expires and clear command comes from BSC to release the SDCCH.
Complete decoding means establish indication must go to MSC from MS(DTAP).
Oh!I’m getting tired:-(