docs: public void marshall(VoiceMessage voiceMessage, ProtocolMarshaller protocolMarshaller) {
  
          if (voiceMessage == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(voiceMessage.getBody(), BODY_BINDING);
              protocolMarshaller.marshall(voiceMessage.getLanguageCode(), LANGUAGECODE_BINDING);
              protocolMarshaller.marshall(voiceMessage.getOriginationNumber(), ORIGINATIONNUMBER_BINDING);
              protocolMarshaller.marshall(voiceMessage.getSubstitutions(), SUBSTITUTIONS_BINDING);
              protocolMarshaller.marshall(voiceMessage.getVoiceId(), VOICEID_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }