code: protected void sendTransferMessageToLocalUser(Mtp3TransferPrimitive msg, int seqControl) {
          if (this.isStarted) {
              MsgTransferDeliveryHandler hdl = new MsgTransferDeliveryHandler(msg);
  
              seqControl = seqControl & slsFilter;
              this.msgDeliveryExecutors[this.slsTable[seqControl]].execute(hdl);
          } else {
              logger.error(String.format(
                      "Received Mtp3TransferPrimitive=%s but Mtp3UserPart is not started. Message will be dropped", msg));
          }
      }
docs: Deliver an incoming message to the local user
  
  @param msg
  @param effectiveSls For the thread selection (for message delivering)