openbsc no sound

hello, I updated my openbsc to newest git version. and since then I do not get any sounds. The setup was working just fine before. So I presume that the problem is within openbsc

<000b> osmo_msc.c:72 Assignment complete should not have been reached. <000b> bsc_api.c:331 Sending ChanModify for speech 0 1 <000b> bsc_api.c:118 Using non speech mode: 0

I think this causes the problem. But I have not changed any configuration files or anything. Can somebody tell me how to fix it? I am using a 1900mhz edge nanobts