RTP-Proxy without MNCC-BuildIn no running

Hi List I want to use OpenBSC with Asterisk and LCR. After a lot of reading I found out that openbsc must start with the Paramters "-m" and "-P". But i got a lot error messages like: <0006> gsm_04_08.c:2960 receive message GSM_TCH_FRAME <0006> gsm_04_08.c:2992 TCH frame to lchan without RTP connection So i tried a lot and start only with -P and the RTP-Proxy started. But LCR and Asterisk sure not involved because the missing "-m". So i need "-m". It is a bug or a feature that "-P" will be ignored if I set "-m"? I´m sitting over the bsc code but until this moment I didnt found something so I hope somebody here can help. Ulrich Meckel