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-Call routing in OpenBSC
-
-Flow of events:
-
- # MO call initiated by MS, CHANNEL RQD, IMMEDIATE ASSIGN
- # MS sends CC SETUP message, we assume already on TCH/H FACCH
- # OpenBSC does a subscriber lookup based on the target extension
- * If a subscriber is found:
- # send CALL PROCEEDING message to MO
- # page the MT subscriber and ask itI to ask for TCH/H
- # once paging completes, we have the TCH/H for the MT end
- # send SETUP to MT
- # receive CALL CONFIRMED from MT
- # set-up the TRAU mux mapping between the E1 subslots for both TCH/H
- # receive ALERTING from MT, route ALERTING to MO
- # receive CONNECT from MT, confirm to MT with CONNECT_ACK
- # send a CONNECT message to MO, receive CONNECT_ACK from MO
- * If subscriber is not found:
- # send RELEASE COMPLETE with apropriate cause to MO (1: unalloacated 3: no route)
-
-
-
-Thoughts about RR/MM:
-
-* we allocate RR/MM entities on demand, when we need them