@PostMapping("create")
    public @ResponseBody
    ResponseEntity<String> create(@RequestBody @Valid OutgoingCallTaskServiceLegacy.CreateCallTaskRequest request) {
        ResponseEntity<String> responseEntity;
        // callTask save logic
        //.....

        // if task created
        responseEntity = new ResponseEntity<>("callTaskId", HttpStatus.OK);
        //else
        responseEntity = new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        return responseEntity;
    }