@GetMapping("campaign/{campaignId}/poll")
    public ResponseEntity<IvoiceApiResponse<List<IncomingCallTaskDto>>>
        findNew(@PathVariable("campaignId") String campaignId,
            @RequestParam(value = "lastTaskId", required = false) String lastTaskId) {
        List<CallTask> newTasks;
        if (Optional.ofNullable(lastTaskId).isPresent()) {
            log.info(format("Requesting call tasks performed after task with id: %s, for campaign: %s", lastTaskId, campaignId));
            newTasks = incomingCallTaskService.findNew(campaignId, lastTaskId);
        } else {
            log.info(format("Requesting call tasks performed for campaign: %s", campaignId));
            newTasks = incomingCallTaskService.findNew(campaignId);
        }

        List<IncomingCallTaskDto> dtos = newTasks.stream()
                .filter((newTask) -> (newTask.getCampaign().equals(campaignId))).map(IncomingCallTaskController::map).collect(Collectors.toList());
        IvoiceApiResponse<List<IncomingCallTaskDto>> apiResponse = IvoiceApiResponse.response(dtos);
        return new ResponseEntity<>(apiResponse, HttpStatus.OK);
    }