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Tuesday, October 23, 2007

SIP Interface to VoiceXML Media Services

Members of the IETF Media Server Control (MEDIACTRL) Working Group have
released an initial Internet Draft for "SIP Interface to VoiceXML Media
Services." Commonly, application servers control media servers use this
protocol for pure VoiceXML processing capabilities. This protocol is
an adjunct to the full MEDIACTRL protocol and packages mechanism.
VoiceXML 2.x is a World Wide Web Consortium (W3C) standard for creating
audio and video dialogs that feature synthesized speech, digitized audio,
recognition of spoken and DTMF key input, recording of audio and video,
telephony, and mixed initiative conversations. VoiceXML allows Web-based
development and content delivery paradigms to be used with interactive
video and voice response applications. The interface described here
leverages a mechanism for identifying dialog media services first
described in RFC 4240. The interface has been updated and extended to
support the W3C Recommendation for VoiceXML 2.0 and VoiceXML 2.1. A set
of commonly implemented functions and extensions have been specified
including VoiceXML dialog preparation, outbound calling, video media
support, and transfers. VoiceXML session variable mappings have been
defined for SIP with an extensible mechanism for passing
application-specific values into the VoiceXML application. Mechanisms
for returning data to the Application Server have also been added. Among
the use cases: CCXML/VoiceXML. CCXML 1.0 defines language elements that
allow for Dialogs to be prepared, started, and terminated; it further
allows for data to be returned by the dialog environment, for call
transfers to be requested (by the dialog) and responded to by the CCXML
application, and for arbitrary eventing between the CCXML application
and running dialog application. The interface described in this document
can be used by CCXML 1.0 implementations to control VoiceXML Media
Servers. More Information See also IETF MEDIACTRL) WG Charter: Click Here

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