code: public void encodeData(AsnOutputStream asnOs) throws MAPException {
          if (this.sendSubscriberData != null) {
              asnOs.writeNullData();
          } else {
              asnOs.writeOctetStringData(this.subscriberDataStored);
          }
      }
docs: /*
  (non-Javadoc)
  
  @see org.restcomm.protocols.ss7.map.primitives.MAPAsnPrimitive#encodeData (org.mobicents.protocols.asn.AsnOutputStream)