do not invoke two Assignments (fixup for re-assignment)
Make sure we wait for Assignment responses before dispatching an
Assignment Request towards RAN.
In particular, when the remote call leg sends its codecs, we may trigger
Re-Assignment to match that codec. Make sure this is done only once:
when receiving another SDP message, wait for the first Assignment.
Implement as an osmo_timer, since there still is no osmo_fsm
implementation for Assignment nor for CC trans FSM. Also it doesn't
belong in the msc_a FSM (it should remain in state COMMUNICATING).
Without this patch, new ttcn3 test TC_lu_and_mo_call_reass_for_mt_codec
sporadically fails, if MNCC with SDP falls in-between Assignment Request
and Assignment Complete.
Related: osmo-msc d767c73a1f93253a54d6a8650a4cf2143353bba0 == I8760feaa8598047369ef8c3ab2673013bac8ac8a
Related: osmo-ttcn3-hacks I402ed0523a2a87b83f29c5577b2c828102005d53
Change-Id: I0f1e1a551aed545b555b9f236fc5967b1e4cc940
diff --git a/include/osmocom/msc/msc_a.h b/include/osmocom/msc/msc_a.h
index a5b624c..d180e38 100644
--- a/include/osmocom/msc/msc_a.h
+++ b/include/osmocom/msc/msc_a.h
@@ -137,6 +137,8 @@
/* There may be up to 7 incoming calls for this subscriber. This is the currently serviced voice call,
* as in, the other person the subscriber is currently talking to. */
struct gsm_trans *active_trans;
+
+ struct osmo_timer_list assignment_request_pending;
} cc;
struct msc_ho_state ho;