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Harald Welte laforge at gnumonks.orgHi Neels, On Fri, Feb 23, 2018 at 12:58:15AM +0100, Neels Hofmeyr wrote: > > Yes, handover can be initiated in any mode of lchan and we saw handovers > > for lchans in GSM48_CMODE_SIGN mode. > > So I think we should be able to cover this case because I didn't find any > > mention in the specs that this case is prohibited for HO. > > I don't know if HO is allowed for CSD (GSM48_CMODE_DATA_*), it should be > > checked. > > But if it is prohibited for CSD, I think we should check and block it on > > the stage of bsc_handover_start or earlier. > > So, what is CMODE_DATA, is it for PDCH / GPRS data? It is, ad Ivan stated, for CSD (circuit switched data). Which was never fully implemented in OsmoBSC at all, only very partially and only with nanoBTS. None f the OsmoBTS code / PHYs support it, and not our TRAU frame handling for the E1/T1 BTSs. So basically, it is unsupported :) -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)