Entity of CC is the independent function entity in conjunction manage（CM） layer which consists in wireless protocol L3. Its main function carries on the control to the call sign between customers

includ-ing the establishment of the call、the release of call and the rebuild of call etc...For the mobile originat-ing all establishment procedure

the test and simulation proedure are carried out by the TTCN tool which is provided by the SDL on the basis of 3GPP TS34123-1-s10. And we analyze the dependability of the design comparing the MSC charts created automatically by the TTCN and the designed MSC charts call control.