code: @Override
      public InitialAddressMessage createIAM() {
          InitialAddressMessage msg = new InitialAddressMessageImpl(_IAM_HOLDER.mandatoryCodes,
                  _IAM_HOLDER.mandatoryVariableCodes, _IAM_HOLDER.optionalCodes, _IAM_HOLDER.mandatoryCodeToIndex,
                  _IAM_HOLDER.mandatoryVariableCodeToIndex, _IAM_HOLDER.optionalCodeToIndex);
          return msg;
      }
docs: /*
  (non-Javadoc)
  
  @see org.restcomm.protocols.ss7.isup.ISUPMessageFactory#createIAM()