code: public VoiceMessageResponse sendVoiceMessage(final String body, final List<BigInteger> recipients) throws UnauthorizedException, GeneralException {
          final VoiceMessage message = new VoiceMessage(body, recipients);
          return messageBirdService.sendPayLoad(VOICEMESSAGESPATH, message, VoiceMessageResponse.class);
      }
docs: Convenient function to send a simple message to a list of recipients
  
  @param body       Body of the message
  @param recipients List of recipients
  @return VoiceMessageResponse
  @throws UnauthorizedException if client is unauthorized
  @throws GeneralException      general exception