Osmocom-bb cell sync problem in my version without HW

Hi everyone, I am working on modification the osmocom-bb project. I try modified the osmocom-bb which could communicate with BTS via UDP sockets. Here you can find the project: https://github.com/clovnrian/osmocom-bb-gprs-no-hw I have problem with cell syncing. This is output from mobile: <0003> gsm322.c:2947 Channel synched. (ARFCN=17, snr=0, BSIC=0) <0003> gsm322.c:698 Starting CS timer with 4 seconds. <0001> gsm322.c:2968 using DSC of 90 The CS timer always timeout. On github you can see what messages BTS sends to mobile. Does anybody know what I have to do to or what message I have to send to mobile? I will be grateful for any help With regards Miroslav Babják