MSC_Tests: Respond to BSSMAP release

The testcase TC_mo_crcx_ran_timeout does not respond to the BSSMAP
relase request that is sent when the MGW times out.

- Acknowledge the release request before waiting for the MSC
  to clear the SSCP connection

Change-Id: Ifcf9ebd2cc5184524ecae735257ed12a0ca70f71
Related OS#2881
Related OS#2882
diff --git a/msc/MSC_Tests.ttcn b/msc/MSC_Tests.ttcn
index cecee69..159538c 100644
--- a/msc/MSC_Tests.ttcn
+++ b/msc/MSC_Tests.ttcn
@@ -1161,6 +1161,11 @@
 	cpars.mgcp_ep := mgcp_cmd.line.ep;
 	/* never respond to this */
 
+	/* When the connection with the MGW fails, the MSC will first request
+	 * a release via call control. We will answer this request normally. */
+	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_RELEASE(cpars.transaction_id)));
+	BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_CC_REL_COMPL(cpars.transaction_id)));
+
 	f_expect_clear(30.0);
 }
 testcase TC_mo_crcx_ran_timeout() runs on MTC_CT {