Regression

SGSN_Tests.TC_attach_rau_a_b (from Titan)

Failing for the past 1 build (Since #2319 )

Unexpected RAU Reject
      SGSN_Tests.ttcn:3757 SGSN_Tests control part
      SGSN_Tests.ttcn:2754 TC_attach_rau_a_b testcase