Cellular Network Infrastructure » Radio Access Network » OsmoBSC

When the MSC hard-releases the SCCP connection, we terminate the bsc_subscr_conn_fsm, which calls lchan_release(conn->lchan, 0, RSL_REL_LOCAL_END); from the fsm cleanup call-back.

That in turn causes a RLL_REL_REQ to be transmitted. However, if the MS never responds to that (out of reach, power-cycle, ...) there appears to be no timer running which would proceed with sending an RSL RF CHAN REL to actually release the channel.

This is currently triggered by TC_bssap_rlsd_does_not_cause_bssmap_reset involuntarily, as it tries to allocate 8 SDCCH.

Attaching a pcap file.

I'll add a dedicated test for this behavior.