How to use RECORD with Voicent Gateway

Voicent Gateway follows the VoiceXML standard implementation for RECORD tag. The example here illustrates the standard vxml file with <RECORD> tag, and a post processing JSP file for handling the recorded file.

The vxml file with <RECORD>

<?xml version="1.0"?>
<vxml version="1.0">

<form id="userecord">
<record name="msg">
  <prompt>
    <audio src="audio/please_record_msg.wav"/>
  </prompt>
  <filled>
    <var name="forwardpage" expr="'/next.jsp'"/>
    <submit next="processwave.jsp"
            method="post"
            namelist="forwardpage msg"/>
  </filled>
</record>

</form>
</vxml>

Once the recording is done, the current VoiceXML interpreter is forwarded to a post processing page "processwave.jsp".

Post processing JSP file

The following code utilizes HTTPClient package.

...
// process the form submission from the vxml page

ByteArrayOutputStream bout = new ByteArrayOutputStream();
InputStream ins = request.getInputStream();
byte[] chunk = new byte [256];
int len;
while ((len = ins.read(chunk)) != -1)
bout.write(chunk, 0, len);

byte[] body = bout.toByteArray();
String dir = application.getRealPath("./audio");
NVPair[] opts = Codecs.mpFormDataDecode(bout.toByteArray(),
                         request.getContentType(),
                         dir);

String forwardpage = null;
String filename = null;
for (int i = 0; i < opts.length; i++) {
  if (opts[i].getName().equals("forwardpage"))
    forwardpage = opts[i].getValue();
  else
    filename = opts[i].getValue();
}
 

// recordFile is the temporary file used by the gateway
File recordFile = new File(dir, filename);

// save to the real recording file
String saveFilename = "myrecording.wav";

// copy file
FileInputStream inf = new FileInputStream(recordFile);
FileOutputStream outf = new FileOutputStream(saveFilename);
byte[] buf = new byte[256];
int ll;
while ((ll = inf.read(buf)) != -1)
outf.write(buf, 0, ll);

inf.close();
outf.close();

if (forwardpage != null) {
  response.sendRedirect(forwardpage);
  return;
}

...