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Network Working Group                                         C. Boulton
Internet-Draft                                                     Avaya
Intended status: Standards Track                            T. Melanchuk
Expires: August 26, 2008                      Rain Willow Communications
                                                            S. McGlashan
                                                         Hewlett-Packard
                                                       February 23, 2008


   A VoiceXML Control Package for the Media Control Channel Framework
               draft-boulton-ivr-vxml-control-package-04

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
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Copyright Notice

   Copyright (C) The IETF Trust (2008).











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Abstract

   This document defines a VoiceXML Control Package for the Media
   Control Channel Framework.  This Control Package extends the Basic
   IVR control package with support for VoiceXML dialogs.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions and Terminology  . . . . . . . . . . . . . . . . .  4
   3.  Control Package Definition . . . . . . . . . . . . . . . . . .  5
     3.1.  Control Package Name . . . . . . . . . . . . . . . . . . .  5
     3.2.  Framework Message Usage  . . . . . . . . . . . . . . . . .  5
     3.3.  Common XML Support . . . . . . . . . . . . . . . . . . . .  5
     3.4.  CONTROL Message Body . . . . . . . . . . . . . . . . . . .  5
     3.5.  REPORT Message Body  . . . . . . . . . . . . . . . . . . .  6
   4.  Element Extensions . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  <dialogprepare>  . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  <dialogstart>  . . . . . . . . . . . . . . . . . . . . . .  7
     4.3.  <event>  . . . . . . . . . . . . . . . . . . . . . . . . .  8
     4.4.  <dialogexit> . . . . . . . . . . . . . . . . . . . . . . .  8
   5.  Element Definitions  . . . . . . . . . . . . . . . . . . . . . 10
     5.1.  <params> . . . . . . . . . . . . . . . . . . . . . . . . . 10
   6.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
   7.  Formal Syntax  . . . . . . . . . . . . . . . . . . . . . . . . 13
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 18
     9.1.  Control Package Registration . . . . . . . . . . . . . . . 18
     9.2.  URN Sub-Namespace Registration . . . . . . . . . . . . . . 18
   10. Change Summary . . . . . . . . . . . . . . . . . . . . . . . . 19
   11. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 20
   12. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 21
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 22
     13.2. Informative References . . . . . . . . . . . . . . . . . . 22
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24
   Intellectual Property and Copyright Statements . . . . . . . . . . 25













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1.  Introduction

   The Media Control Channel Framework [MCCF] provides a generic
   approach for establishment and reporting capabilities of remotely
   initiated commands.  The Framework utilizes many functions provided
   by the Session Initiation Protocol [RFC3261] (SIP) for the rendezvous
   and establishment of a reliable channel for control interactions.
   The Control Framework also introduces the concept of a Control
   Package.  A Control Package is an explicit usage of the Control
   Framework for a particular interaction set.

   This specification defines a Control Package for IVR functions using
   VoiceXML 2.0 dialogs ([VXML20], [VXML21]).  As a recognized
   international standard for IVR dialogs, VoiceXML is used extensively
   within media server control languages (cf. [CCXML10], [MSML],
   [RFC4240]).

   To ensure interoperability, implementations MUST support VoiceXML 2.0
   dialogs.  They SHOULD support later versions of VoiceXML (e.g.
   [VXML21]).

   The VoiceXML package extends the basic IVR control package
   ([BASEIVRCP]) by replacing the basic ivr dialog type with a VoiceXML
   dialog type.  In particular, this package

   1.  extends <dialogprepare> and <dialogstart> elements to include
       inline <vxml> dialogs, http related attributes and a <params>
       element to pass information into the dialog.

   2.  extends <dialogexit> to provide VoiceXML exit information

   Otherwise, this package follows precisely the syntax and semantics of
   the basic IVR control package.


















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2.  Conventions and Terminology

   In this document, BCP 14/RFC 2119 [RFC2119] defines the key words
   "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
   "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL".  In addition, BCP 15 indicates requirement levels for
   compliant implementations.

   The additional terms defined in Section 2 of [BASEIVRCP] are used in
   this document.









































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3.  Control Package Definition

   This section fulfills the mandatory requirement for information that
   MUST be specified during the definition of a Control Framework
   Package, as detailed in Section 8 of [MCCF].

3.1.  Control Package Name

   The Control Framework requires a Control Package definition to
   specify and register a unique name and version.

   The name and version of this Control Package is "msc-ivr-vxml/1.0"
   (Media Server Control - Interactive Voice Response - VoiceXML -
   version 1.0).  Its IANA registration is specified in Section 9.1.

3.2.  Framework Message Usage

   The Control Framework requires a Control Package to explicitly detail
   the control messages that can be used as well as provide an
   indication of directionality between entities.  This will include
   which role type is allowed to initiate a request type.

   This package adheres to Framework Message usage defined in Section
   3.2 of [BASEIVRCP].  This package extends the dialog control elements
   as defined in Section 4; additional elements are defined in
   Section 5.  A XML Schema for this package is provided in Section 7.

   Implementation of this control package MUST adhere to the syntax and
   semantics of XML elements defined in this document.  In cases where
   there is a difference in constraints between the XML schema and the
   textual description of elements, the textual definition takes
   priority.

3.3.  Common XML Support

   The Control Framework requires a Control Package definition to
   specify if the attributes for media dialog or conference references
   are required.

   This package adheres to Common XML Support defined in Section 3.3 of
   [BASEIVRCP].

3.4.  CONTROL Message Body

   The Control Framework requires a Control Package to define the
   control body that can be contained within a CONTROL command request
   and to indicate the location of detailed syntax definitions and
   semantics for the appropriate body types.



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   This package adheres to CONTROL Message Body as defined in Section
   3.4 of [BASEIVRCP].

3.5.  REPORT Message Body

   The Control Framework requires a control package definition to define
   the REPORT body that can be contained within a REPORT command
   request, or that no report package body is required.  This section
   should indicate the location of detailed syntax definitions and
   semantics for the appropriate body types.

   This package adheres to REPORT Message Body as defined in Section 3.5
   of [BASEIVRCP].






































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4.  Element Extensions

   The XML elements used in this package are those defined in Section 4
   of [BASEIVRCP] unless otherwise specified in this section.

4.1.  <dialogprepare>

   This package extends the definition of <dialogprepare> request in
   Section 4.1.1 of [BASEIVRCP] as follows.

   The <dialogprepare> element has the following modified attributes:

   src:  implementations MUST support the HTTP protocol

   type:  The default value is "application/voicexml+xml".

   The <dialogprepare> element has the following additional attributes:

   maxage:  string defining a time interval according to the max-age
      parameter in HTTP.  The attribute is optional.

   maxstale:  string defining a time interval according to the max-stale
      parameter in HTTP.  The attribute is optional.

   method:  string indicating the HTTP method to use.  Permitted values
      are "post" or "get".  The default value is "get".  The attribute
      is optional.

   enctype:  string identifying the encoding type of the submitted
      document (when the value of the method attribute is 'post').  The
      default value is "application/x-www-form-url-encoded".  The
      attribute is optional.

   The <dialogprepare> element has the following additional child
   elements:

   <vxml>:  contains an inline VoiceXML document in the VoiceXML
      namespace.  The element is optional.

4.2.  <dialogstart>

   This package extends the definition of <dialogstart> request in
   Section 4.1.2 of [BASEIVRCP] as follows.

   The <dialogstart> element has the following modified attributes:






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   src:  implementations MUST support the HTTP URI protocol

   type:  The default value is "application/voicexml+xml".

   The <dialogstart> element has the following additional attributes:

   maxage:  string defining a time interval according to the max-age
      parameter in HTTP.  The attribute is optional.

   maxstale:  string defining a time interval according to the max-stale
      parameter in HTTP.  The attribute is optional.

   method:  string indicating the HTTP method to use.  Permitted values
      are "post" or "get".  The default value is "get".  The attribute
      is optional.

   enctype:  string identifying the encoding type of the submitted
      document (when the value of the method attribute is 'post').  The
      default value is "application/x-www-form-url-encoded".  The
      attribute is optional.

   The <dialogstart> element has the following additional child elements
   defined:

   <vxml>:  contains an inline VoiceXML document in the VoiceXML
      namespace.  The element is optional.

   <params>:  an XML data structure (see Section 5.1) to pass parameters
      into the dialog.  The element is optional.

   [Editors Note: further work is required to define how connection
   related information is passed to the VoiceXML interpreter.]

4.3.  <event>

   Transfer behavior is not defined.

   [Editors Note: A later version of this package may specify how
   <event> is extended with child elements describing transfer events.]

4.4.  <dialogexit>

   This package extends the definition of <dialogexit> in Section 4.3.2
   of [BASEIVRCP] as follows.

   The <dialogexit> element has the following additional attributes:





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   termmode:  indicates how the voicexml dialog was terminated.  Valid
      values are: exit, disconnect, or implementation specific string
      values beginning with "_".  The attribute is mandatory.

   The <dialogexit> element has the following additional child element:

   <params>:  parameters returned from the dialog.  The element is
      optional.











































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5.  Element Definitions

5.1.  <params>

   The <params> element is a general container for parameterized data.

   The <data> element has no attributes, but has the following child
   elements defined:

   <param>:  specifies a parameter.  Multiple instances of this element
      are permitted.  The element is mandatory.

   The <param> element has the following attributes:

   name:  a string indicating the name of the parameter.  The attribute
      is mandatory.

   type:  a string indicating the type of the value.  The attribute is
      optional.  The default is a string type.

   value:  a string indicating the value of the parameter. separation.
      The attribute is mandatory.

   The <param> element has no children.

   [Editors Note: this defintion of <param> may be extended in a later
   version to allow inline binary data, used reporting recordings when
   the dialog exits. ]























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6.  Examples

   [Editors Note: this section needs further work.]

   Example: a request to prepare a dialog where the dialog script is is
   referenced:

   <dialogprepare type="application/voicexml+xml"
                     src="http://www.example.com/playprompt.vxml">
   </dialogprepare>

   In the following example, the VoiceXML dialog script is specified
   inline:

   <dialogprepare>
      <vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
         <form id='main'>
            <block>
               <audio expr="http://www.example.com/media/prompt1.wav"/>
               <exit/>
             </block>
         </form>
      </vxml>
   </dialogprepare>

   The following example shows a request to start a dialog on a
   conference where the dialog script is indicated using the src
   attribute:

    <dialogstart conferenceid="conference11"
       type="application/voicexml+xml"
       src="http://www.example.com/playprompt.vxml">
       <params>
         <param name="media"
         value="http://www.example.com/media/prompt1.wav"/>
       </params>
    </dialogstart>

   Where the parameter "media" would be available in the VoiceXML script
   as "connection.ccxml.values.media" so different prompts can be played
   using the same dialog script.

   In the following example, the VoiceXML dialog script is specified
   inline.







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    <dialogstart conferenceid="conference11">
        <vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
         <form id='main'>
            <block>
               <audio expr="http://www.example.com/media/prompt1.wav"/>
               <exit/>
             </block>
          </form>
        </vxml>
     </dialogstart>









































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7.  Formal Syntax

   This package defines an XML schema which extends the msc-ivr-
   common.xsd schema defined in Section 9 of [BASEIVRCP].

   All elements in the defined schema are in the
   urn:ietf:params:xml:ns:msc-ivr-vxml namespace.

  <?xml version="1.0" encoding="UTF-8"?>
  <xsd:schema targetNamespace="urn:ietf:params:xml:ns:msc-ivr-vxml"
   xmlns:fw="urn:ietf:params:xml:ns:control:framework-attributes"
   elementFormDefault="qualified"
   xmlns="urn:ietf:params:xml:ns:msc-ivr-vxml"
   xmlns:vxml="http://www.w3.org/2001/vxml"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema">


   <xsd:annotation>
    <xsd:documentation>
     IETF MediaCtrl VoiceXML IVR 1.0 (20080225)

     This is the schema of the VoiceXML IVR Control Package.
     It imports the msc-ivr-common schema (dialogprepare, etc)
     and extends them for VoiceXML support.

     The schema namespace is urn:ietf:params:xml:ns:msc-ivr-vxml

    </xsd:documentation>
   </xsd:annotation>


   <!--
    #############################################################

    SCHEMA IMPORTS

    #############################################################
   -->


   <xsd:redefine schemaLocation="msc-ivr-common.xsd">
    <xsd:annotation>
     <xsd:documentation>
      This import brings in the IVR common package Redefinitions: [1]
      Adds http related attributes in dialogprepare [2] Adds http
      related attributes in dialogstart [3] Allow params in dialogstart
      [4] Adds attribute and params to dialogexit
     </xsd:documentation>



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    </xsd:annotation>

    <xsd:attributeGroup name="msc.ivr.common.dialogprepare.attlist">
     <xsd:attributeGroup ref="msc.ivr.common.dialogprepare.attlist" />
     <xsd:attributeGroup ref="httpparams" />
    </xsd:attributeGroup>


    <xsd:group name="msc.ivr.common.dialogstart.mix">
     <xsd:choice>
      <xsd:group ref="msc.ivr.common.dialogstart.mix" />
      <xsd:element ref="params" minOccurs="0" maxOccurs="1" />
     </xsd:choice>
    </xsd:group>


    <xsd:attributeGroup name="msc.ivr.common.dialogstart.attlist">
     <xsd:attributeGroup ref="msc.ivr.common.dialogstart.attlist" />
     <xsd:attributeGroup ref="httpparams" />
    </xsd:attributeGroup>


    <xsd:attributeGroup name="msc.ivr.common.dialogexit.attlist">
     <xsd:attributeGroup ref="msc.ivr.common.dialogexit.attlist" />
     <xsd:attribute name="termmode" type="vxml_termmode.datatype"
      use="required" />
    </xsd:attributeGroup>


    <xsd:group name="msc.ivr.common.dialogexit.mix">
     <xsd:choice>
      <xsd:group ref="msc.ivr.common.dialogexit.mix" />
      <xsd:element ref="params" minOccurs="0" maxOccurs="1" />
     </xsd:choice>
    </xsd:group>

   </xsd:redefine>



   <!--
    #############################################################

    ELEMENTS

    #############################################################
   -->




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   <!-- params -->

   <xsd:attributeGroup name="msc.ivr.vxml.params.attlist">
    <xsd:attributeGroup ref="msc.common.attribs" />
   </xsd:attributeGroup>

   <xsd:group name="msc.ivr.vxml.params.mix">
    <xsd:choice>
     <xsd:element ref="param" minOccurs="1" maxOccurs="unbounded" />
     <xsd:group ref="msc.common.content" minOccurs="0"
      maxOccurs="unbounded" />
    </xsd:choice>
   </xsd:group>

   <xsd:group name="msc.ivr.vxml.params.content">
    <xsd:sequence>
     <xsd:group ref="msc.ivr.vxml.params.mix" minOccurs="0"
      maxOccurs="unbounded" />
    </xsd:sequence>
   </xsd:group>

   <xsd:complexType name="msc.ivr.vxml.params.type">
    <xsd:group ref="msc.ivr.vxml.params.content" />
    <xsd:attributeGroup ref="msc.ivr.vxml.params.attlist" />
   </xsd:complexType>

   <xsd:element name="params" type="msc.ivr.vxml.params.type" />

   <!--  param -->

   <xsd:attributeGroup name="msc.ivr.vxml.param.attlist">
    <xsd:attribute name="name" type="xsd:string" use="required" />
    <xsd:attribute name="valuetype" type="xsd:string" />
    <xsd:attribute name="value" type="xsd:string" />
    <xsd:attributeGroup ref="msc.common.attribs" />
   </xsd:attributeGroup>

   <xsd:group name="msc.ivr.vxml.param.mix">
    <xsd:choice>
     <xsd:group ref="msc.common.content" minOccurs="0"
      maxOccurs="unbounded" />
    </xsd:choice>
   </xsd:group>

   <xsd:group name="msc.ivr.vxml.param.content">
    <xsd:sequence>
     <xsd:group ref="msc.ivr.vxml.param.mix" minOccurs="0"
      maxOccurs="unbounded" />



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    </xsd:sequence>
   </xsd:group>

   <xsd:complexType name="msc.ivr.vxml.param.type" mixed="true">
    <xsd:group ref="msc.ivr.vxml.param.content" />
    <xsd:attributeGroup ref="msc.ivr.vxml.param.attlist" />
   </xsd:complexType>

   <xsd:element name="param" type="msc.ivr.vxml.param.type" />


   <!--
    #############################################################

    ATTRIBUTES

    #############################################################
   -->

   <xsd:attributeGroup name="httpparams">
    <xsd:attribute name="maxage" type="timedesignation.datatype" />
    <xsd:attribute name="maxstale" type="timedesignation.datatype" />
    <xsd:attribute name="enctype" type="xsd:string"
     default="application/x-www-form-urlencoded" />
    <xsd:attribute name="method" type="method.datatype" default="get" />
   </xsd:attributeGroup>


   <!--
    #############################################################

    DATATYPES

    #############################################################
   -->

   <xsd:simpleType name="method.datatype">
    <xsd:restriction base="xsd:NMTOKEN">
     <xsd:enumeration value="get" />
     <xsd:enumeration value="post" />
    </xsd:restriction>
   </xsd:simpleType>

   <xsd:simpleType name="vxml_termmode.datatype">
    <xsd:restriction base="xsd:string"></xsd:restriction>
   </xsd:simpleType>

  </xsd:schema>



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8.  Security Considerations

   As this control package uses XML markup, implementation MUST address
   the security considerations of [RFC3023].















































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9.  IANA Considerations

   This specification instructs IANA to register a new Media Control
   Channel Framework Package and a new XML namespace.

9.1.  Control Package Registration

   Control Package name: msc-ivr-vxml/1.0

9.2.  URN Sub-Namespace Registration

   XML namespace: urn:ietf:params:xml:ns:msc-ivr-vxml







































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10.  Change Summary

   The following are the primary changes between the -04 of the draft
   and the -03 version.

   o  Aligned with the -06 version of the basic ivr control package.

   o  Simplified the structure so that only differences with the basic
      ivr control package are specified.

   o  Specified how VoiceXML data is returned in a <dialogexit>

   o  replaced <data> with <params>

   o  updated references

   The following are the primary changes between the -03 of the draft
   and the -02 version.

   o  None

   The following are the primary changes between the -02 of the draft
   and the -01 version.

   o  Updated references.

   The following are the primary changes between the -01 of the draft
   and the -00 version.

   o  Changes in Basic IVR package version 02 applied.





















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11.  Contributors

   Asher Shiratzky from Radvision provided valuable support and
   contributions to the early versions of this document.















































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12.  Acknowledgments

   TBD
















































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13.  References

13.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

13.2.  Informative References

   [BASEIVRCP]
              Boulton, C., Melanchuk, T., and S. McGlashan, "A Basic
              Interactive Voice Response (IVR) Control Package for the
              Media Control Channel Framework",
              draft-boulton-ivr-control-package-06 (work in progress),
              February 2008.

   [CCXML10]  Auburn, R J., "Voice Browser Call Control: CCXML Version
              1.0", W3C Working Draft (work in progress), January 2007.

   [MCCF]     Boulton, C., Melanchuk, T., McGlashan, S., and A.
              Shiratzky, "Media Control Channel Framework",
              draft-ietf-mediactrl-sip-control-framework-01 (work in
              progress), February 2008.

   [MSML]     Saleem, A., Xin, Y., and G. Sharratt, "Media Session
              Markup Language (MSML)", draft-saleem-msml-06 (work in
              progress), February 2008.

   [RFC2616]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.

   [RFC3023]  Murata, M., St. Laurent, S., and D. Kohn, "XML Media
              Types", RFC 3023, January 2001.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              June 2002.

   [RFC3262]  Rosenberg, J. and H. Schulzrinne, "Reliability of
              Provisional Responses in Session Initiation Protocol
              (SIP)", RFC 3262, June 2002.

   [RFC3263]  Rosenberg, J. and H. Schulzrinne, "Session Initiation
              Protocol (SIP): Locating SIP Servers", RFC 3263,
              June 2002.




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   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
              with Session Description Protocol (SDP)", RFC 3264,
              June 2002.

   [RFC4240]  Burger, E., Van Dyke, J., and A. Spitzer, "Basic Network
              Media Services with SIP", RFC 4240, December 2005.

   [RFC4574]  Levin, O. and G. Camarillo, "The Session Description
              Protocol (SDP) Label Attribute", RFC 4574, August 2006.

   [RFC4722]  Van Dyke, J., Burger, E., and A. Spitzer, "Media Server
              Control Markup Language (MSCML) and Protocol", RFC 4722,
              November 2006.

   [VXML20]   McGlashan, S., Burnett, D., Carter, J., Danielsen, P.,
              Ferrans, J., Hunt, A., Lucas, B., Porter, B., Rehor, K.,
              and S. Tryphonas, "Voice Extensible Markup Language
              (VoiceXML) Version 2.0", W3C Recommendation, March 2004.

   [VXML21]   Oshry, M., Auburn, RJ., Baggia, P., Bodell, M., Burke, D.,
              Burnett, D., Candell, E., Carter, J., McGlashan, S., Lee,
              A., Porter, B., and K. Rehor, "Voice Extensible Markup
              Language (VoiceXML) Version 2.1", W3C Recommendation,
              June 2007.



























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Authors' Addresses

   Chris Boulton
   Avaya
   Building 3
   Wern Fawr Lane
   St Mellons
   Cardiff, South Wales  CF3 5EA

   Email: cboulton@avaya.com


   Tim Melanchuk
   Rain Willow Communications

   Email: tim.melanchuk@gmail.com


   Scott McGlashan
   Hewlett-Packard
   Gustav III:s boulevard 36
   SE-16985 Stockholm, Sweden

   Email: scott.mcglashan@hp.com



























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Full Copyright Statement

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