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Holger Hans Peter Freyther holger at freyther.deOn Mon, Jul 07, 2014 at 01:39:06PM +0200, Norbert Englberger wrote: > Hello everybody, Hi, > > 1. The students told me, that OpenBSC doesn't behave like all the BTS from > commercial Providers they analysed: > The say that on commercial nets at the beginning of a phone call there will > be send an "Immediate assignment" sending the MS always to a SDCCH on TS 1 > or TS2 where the encryption will be startet. After establishing the > encryption another "Immediate assignment" will occour and send the MS to a > Traffic Channel (which also contains the FACCH / SACCH) for the actual > Communication. > OpenBSC also sends the "Immediate assignment" on TS0 but sends the MS > directly to Timeslot with a Traffic Channel where all the signalling, like > encryption, will be done in the SACCH. > Is there any way to configure OsmoBSC to behave like the commercial BTS the > students described? it is not a question of BTS but the BSC. The role of the BSC is to manage the channels. Inside src/libbsc/gsm_04_08_utils.c you will see a table that determines how the BSC/NITB will respond to "channel request" inside the RACH request by the phone. E.g. if you change get_ctype_by_chreq to always return LCHAN_SDCCH you should be close to the behavior you have described.