MSC_Tests.ttcn: introduce TC_gsup_mt_sms_{ack|err}

The idea of this test case is to verify MT SMS transmission
initiated by ESME over GSUP. Basically, the algorythm is
the following:

  1.0 send MT-ForwardSM-Req on GSUP,
  1.1 expect Paging Request on RAN,
  1.2 establish a RAN connection,
  1.3 expect CP-DATA/RP-DATA on BSSAP/DTAP,
  2.1 send CP-DATA/RP-ACK on BSSAP/DTAP,
  2.2.a expect MT-ForwardSM-Res,
  2.2.b expect MT-ForwardSM-Err.

Change-Id: I63a25c8366cce0852df6b628365151661a22a25f
Related: OS#3587
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index 8a5822d..7a35296 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -65,6 +65,8 @@
   <testcase classname='MSC_Tests' name='TC_smpp_mt_sms' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_gsup_mo_sms' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_gsup_mo_smma' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_gsup_mt_sms_ack' time='MASKED'/>
+  <testcase classname='MSC_Tests' name='TC_gsup_mt_sms_err' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_and_mo_ussd_single_request' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_and_mt_ussd_notification' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_and_mo_ussd_during_mt_call' time='MASKED'/>