code: public ApiResponse<ApiSuccessResponse> initiateTransferWithHttpInfo(String id, InitiateTransferData initiateTransferData) throws ApiException {
          com.squareup.okhttp.Call call = initiateTransferValidateBeforeCall(id, initiateTransferData, null, null);
          Type localVarReturnType = new TypeToken<ApiSuccessResponse>(){}.getType();
          return apiClient.execute(call, localVarReturnType);
      }
docs: Initiate a transfer
  Initiate a two-step transfer by placing the first call on hold and dialing the destination number (step 1). After initiating the transfer, you can use [/voice/calls/{id}/complete-transfer](/reference/workspace/Voice/index.html#completeTransfer) to complete the transfer (step 2).
  @param id The connection ID of the call to be transferred. This call will be placed on hold. (required)
  @param initiateTransferData  (required)
  @return ApiResponse&lt;ApiSuccessResponse&gt;
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body