Hi 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 <lafo...@gnumonks.org>           http://laforge.gnumonks.org/
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