System information type 5 & 6

[g.roelant at telenet.be]

Hi, 

i'm capturing my own voice calls in wireshark. 
i can see a system information type packet just before ciphering command. 
204 frames further there is a system information type 6 packet. 

but these 2 packets don't resamble... 
how can i subtract a key out of these 2 different packets? 

this doesn't make any sens.... 

if i look for the same type 5 packet... they are never at the same location.... :( 

is my reasoning wrong? 
kind regards 
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