Call Control Requirements in a Voice Browser Framework

This document describes requirements for mechanisms that enable fine-grained control of speech (signal processing) resources and telephony resources in a VoiceXML telephony platform. The scope of these language features is for controlling resources in a platform on the network edge, not for building network-based call processing applications in a telephone switching system, or for controlling an entire telecom network.

Status of this Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. The latest status of this document series is maintained at the W3C.

This document describes the requirements for markup used for call control, as a precursor to work on a specification. You are encouraged to subscribe to the public discussion list <www-voice@w3.org> and to mail us your comments. To subscribe, send an email to <www-voice-request@w3. org> with the word subscribe in the subject line (include the word unsubscribe if you want to unsubscribe). A public archive is available online.

This document has been produced as part of the W3C Voice Browser Activity, following the procedures set out for the W3C Process. The authors of this document are members of the Voice Browser Working Group (W3C Members only).

Publication as a Working Draft does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite W3C Working Drafts as other than “work in progress”.

1. Introduction

The main goal of this subgroup is to establish a prioritized list of requirements for call control in a voice browser environment.

The process will consist of the following steps:

1. Collect requirements on call control.
2. Prioritize these requirements.
3. Distribute requirements to, and take feedback from, relevant groups working on call control in telephony systems.
4. Define specifications for call control components, based on the feedback received.

1.1 Scope

The core activity focuses on enabling extended call control functionality in a voice browser which supports telephony capabilities. The VoiceXML specification states that “VoiceXML is designed for creating audio dialogs that feature synthesized speech, digitized audio, recognition of spoken and DTMF key input, recording of spoken input, telephony, and mixed-initiative conversations.” This activity will therefore specify richer telephony functionality in a voice browser framework.

The task is constrained to defining elements and capabilities which either provide augmented functionality to be used in combination with VoiceXML or enhance the existing functionality in VoiceXML.

This document specifies requirements that define the capabilities of a voice browser which supports telephony applications.
1.2 Interaction with Other Sub Groups

The activities of the Call Control Subgroup will be coordinated with the activities of the Dialog Subgroup (both of which are part of the W3C Voice Browser working group).

Source : http://www.w3.org/TR/call-control-reqs/