code: public boolean hasAllMandatoryParameters() {
          if (!super.f_Parameters.keySet().containsAll(mandatoryParam) || super.f_Parameters.values().contains(null)) {
              return false;
          }
          if (!super.v_Parameters.containsKey(_INDEX_V_CalledPartyNumber)
                  || super.v_Parameters.get(_INDEX_V_CalledPartyNumber) == null) {
              return false;
          }
          return true;
      }
docs: /*
  (non-Javadoc)
  
  @see org.mobicents.isup.messages.ISUPMessage#hasAllMandatoryParameters()