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msc/BSC_ConnHdlr: f_call_hangup: unregister IMSI

Fix the missing call to f_ran_unregister_imsi when running f_mt_call():

f_mt_call()
-> f_mt_call_establish()
   -> f_ran_register_imsi()
-> f_call_hangup()
   -> f_ran_unregister_imsi()

This is in preparation for calling f_mt_call() multiple times during one
test, to test various CSD bearer services. Without this patch, it will
result in a "No space left in ImsiTable" error.

Related: OS#4394
Change-Id: Ie9b180b95348d7e84650c14a331c5091a1e67d1f
---
M msc/BSC_ConnectionHandler.ttcn
1 file changed, 24 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/94/33594/1

diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index 8c9f63f..4eedeee 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -1839,6 +1839,8 @@
 
 	deactivate(mdcx);
 	deactivate(dlcx);
+
+	f_ran_unregister_imsi(g_pars.imsi);
 }
 
 function f_mt_call(inout CallParameters cpars)

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