docs: public ServiceCall<VoiceModels> listVoiceModels(ListVoiceModelsOptions listVoiceModelsOptions) {
      String[] pathSegments = { "v1/customizations" };
      RequestBuilder builder = RequestBuilder.get(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("text_to_speech", "v1", "listVoiceModels");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/json");
      if (listVoiceModelsOptions != null) {
        if (listVoiceModelsOptions.language() != null) {
          builder.query("language", listVoiceModelsOptions.language());
        }
      }
      return createServiceCall(builder.build(), ResponseConverterUtils.getObject(VoiceModels.class));
    }