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Review: Telera DeVXchange (Part II)

  • December 9, 2002
  • By Hitesh Seth
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Telera Extensions

To enable development of better call-control features (over and above the basic functionality that is supported by VoiceXML platform), the Telera Voice platform has created a number of extensions. The table below lists the various extensions and their functionality.

Call Control Elements Description
ALERT_LEG Alerting a  call-leg and direct it to a specified URL
BRIDGE_CALL Bridges the current call with another call
CREATE_LEG_AND_DIAL Enables a voice application to make outbound calls. This provides enhanced functionality over VoiceXML's <transfer> element 
END_SESSION Destroys all legs of the session
HANGUP_AND_DESTROY_LEG Terminates the call
LEG_WAIT Puts the executing VoiceXML interpreter in the wait stage
QUEUE_CALL Puts the call on hold
REXFER Transfers the call from one call-center agent to another
SCRIPT_RESULT Returns the results of a script execution
SET Provides a state management mechanism to otherwise stateless voice applications
UBRIDGE_CALL Breaks the bridge between the specified legs of the call

Let's look at the functionality of one of extensions by taking a look at an example. The example below shows an interactive voice application that is allowing the user to say "Customer Service" in order to be connected to a customer service representative. The CREATE_LEG_AND_DIAL element connects the caller with the agent specified in the TELNUM attribute. The IVRURL specifies the document to execute for the second leg once the call has been connected. Using these extensions it is actually possible for the application to "whisper" information about the caller to the agent before bridging the call.


Overall, I believe CodeCenter has the necessary toolsets for a useful VoiceXML development platform, with the key being support for the VoiceXML 2.0, call tracer, grammar verifier/manager and outbound notification. The extensions are definitely interesting and provide a lot of added functionality on-top of VoiceXML, but should probably evolve through support of a standard such as CCXML. AppBuilder has a lot of potential for being a server-side dynamic VoiceXML application tool, however, it does need to be upgraded to support VoiceXML 2.0 and CCXML.


About Hitesh Seth

A freelance author and known speaker, Hitesh is a columnist on VoiceXML technology and regularly writes for technology publications including Java Developer's Journal, Web Services Journal, XML Journal and The Computer Bulletin on emerging technology topics such as J2EE, Microsoft .NET, XML, Wireless Computing, Speech Applications, Web Services & Enterprise/B2B Integration. He is the conference chair for VoiceXML Planet Conference & Expo. Hitesh received his Bachelors Degree from the Indian Institute of Technology Kanpur (IITK), India. Feel free to email any comments or suggestions about the articles featured in this column at hks@hiteshseth.com.

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