MSC_Tests.ttcn: introduce TC_gsup_mo_sms for MO SMS over GSUP

The idea of this test case is to verify MO SMS transmission
over GSUP towards HLR. Basically, the algorythm is the following:

  1.0 establish a RAN connection,
  2.1 send CP-DATA/RP-DATA on BSSAP/DTAP,
  2.2 expect MO-ForwardSM-Req on GSUP,
  3.1 send MO-ForwardSM-Res on GSUP,
  3.2 expect CP-DATA/RP-ACK on BSSAP/DTAP.

Change-Id: Id14bbd8bd51558cdacefea0fe042769cd69ed5c8
Related: OS#3587
2 files changed