asterisk: TC_ims_call_mo: unregister IMS during test teardown

Change-Id: Ifaf9a2991d9edd5614a3fc048357da3d1e240714
diff --git a/asterisk/Asterisk_Tests.ttcn b/asterisk/Asterisk_Tests.ttcn
index 20a9e6c..ba7cb38 100644
--- a/asterisk/Asterisk_Tests.ttcn
+++ b/asterisk/Asterisk_Tests.ttcn
@@ -446,6 +446,7 @@
 	COORD.send(COORD_CMD_CALL_ESTABLISHED);
 	as_IMS_exp_call_hangup(g_pars.subscr.cp.sip_seq_nr + 1);
 	setverdict(pass);
+	as_IMS_unregister();
 }
 testcase TC_ims_call_mo() runs on test_CT {
 	var SIPConnHdlrPars sip_pars;
@@ -485,6 +486,11 @@
 
 	COORD.send(COORD_CMD_HANGUP) to vc_conn_sip;
 
+	/* Trigger unregistration: */
+	f_sleep(1.0);
+	AMI_CLIENT.clear;
+	f_AMI_IMS_unregister(ims_pars);
+
 	vc_conn_sip.done;
 	vc_conn_ims.done;
 	f_shutdown();