Call progress on nightly build

I have trx, bts, bsc, msc, stp, hlr, and sip installed... asterisk runs on a separate machine, i.e. my ordinary pbx, with just the recomended changes to sip and extensions. When dialling an external number I do not get any call progress (ringing) in the MS. Phone is quiet as I dial the number, when the call is answered voice is "suddenly" there, this is a difference from "latest" where call progress was audiable but had only oneway audio. I run HLR with the -U switch, there seems to be a difference between "latest" and "nightly", what does the -U switch do, modify the database, or just run HLR in backward compatibility mode? Should I delete / reregister phones? Regards, Gullik