i uploaded an inofficial test version of openbsc with all my patches applied. (not the latest, but working well). you will find it here: http://www.linux-call-router.de/download/lcr-1.5/ all ressources get freed, no hanging logical channels or subscriber instances in any test case i found.

also linux-call-router, an alternative application to bsc_hack, the gsm speech codec and mISDN kernel drivers are available there.