about RACH DOS

I am a student in a University studying on the security of GSM, recently I want use osmocomBB to realize the RACH DOS attack mentioned in Dieter Spaar`s speech. but I meet some difficulty.

I do as follow:

continuely sending RACH to a cell,and ignore the GSM48_MT_RR_IMM_ASS message ,also i lock my phone to the attacked cell,but after some time,the phone can still call to some phone ,why?

can anyone help me?

thanks!

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