Part I: Developing Inbound Applications - DTMF

DTMF tones are the tones used in telephones for tone dialing. Traditionally, they are the only means user can interact with a telephony application.

The following provides the same functionality as the one in previous section except it uses DTMF tones for time zone selection.

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

<%@ page import="java.util.Date" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.util.TimeZone" %>

<% 
    response.setHeader("Cache-Control","no-cache");
   
    Date d = new Date(System.currentTimeMillis());
   
    String tz = request.getParameter("tz");
    TimeZone timez = null;
    if ("1".equals(tz))
        timez = TimeZone.getTimeZone("America/Los_Angeles");
    else if ("2".equals(tz))
        timez = TimeZone.getTimeZone("America/Denver");
    else if ("3".equals(tz))
        timez = TimeZone.getTimeZone("America/Chicago");
    else if ("4".equals(tz))
        timez = TimeZone.getTimeZone("America/New_York");  
   

    SimpleDateFormat f;

    if (timez != null) {
        f = new SimpleDateFormat("hh:mm a, zzzz");
        f.setTimeZone(timez);
    }
    else {
        f = new SimpleDateFormat("hh:mm a");
    }
%>

<form id="td">
  <field name="tz">
    <prompt timeout="10s">
      <block>
        <audio src="audio/welcome.wav"/>
        <%= f.format(d) %>
        <audio src="audio/which_timezone_dtmf.wav"/>
      </block>
    </prompt>
    <dtmf>
      1 | 2 | 3 | 4
    </dtmf>
    <filled>
      <submit next="/td/timeofday.jsp" namelist="tz"/>
    </filled>
  </field>
</form>

</vxml>

Save the content as timeofday.jsp. It is OK to overwrite the original content, we'll visit that again later. Also record a new voice prompt, such as "press 1 for pacific time, ..., press 4 for eastern time", and save it as which_timezone_dtmf.wav under <tddir>/webapps/audio.

Restart the Gateway and call in the test again.

Download the sample code: timeofday_step5.zip.