Overview

The VXML implementation here is highly piecemeal. It is not even close to complete and while roughly following the VXML 2.0 standard there are many incompatibilities. Below is a list of what is available.

Elements & Attributes Supported

Supported tag	Supported attributes	Notes
<menu>	dtmf	property.timeout is supported
<choice>	dtmf, next, expr, event
<form>	id	property.timeout is supported
<field>	name, cond
<prompt>	bargein, cond	property.bargein is supported
<grammar>	mode, type	Only "dtmf" is supported for "mode" Only "X-OPAL/digits" is supported for "type" The "X-OPAL/digits" grammar consists of three parameters of the form: minDigits=1; maxDigits=5; terminators=#
<filled>
<noinput>	count, cond
<nomatch>	count, cond
<error>	count, cond
<catch>	count, event	Note there is a limited set of events that are thrown
<goto>	nextitem, expritem, expr
<exit>	No attributes supported
<submit>	next, expr, enctype, method, fetchtimeout, namelist
<disconnect>	No attributes needed
<block>	cond
<audio>	src, expr
<break>	msecs, time, size
<value>	expr, class, voice	class & voice are VXMKL 1.0 attributes and will be removed when <say-as;> is implemented.
<script>	src
<var>	name, expr
<property>	name", value
<if>	cond
<elseif>	cond
<else>	No attributes needed
<transfer>	name, dest, destexpr, bridge, cond
<record>	name, type, beep, dtmfterm, maxtime, finalsilence, cond

Scripting support

Depending on how the system was built there are three possibilities:

Ultra-primitive	Here, all variables are string types, the only expressions possible are string concatenation using '+' operator. Literals using single quotes are allowed. For <if> only the == and != operator may be used.
Lua	While a full scripting language, this is not ECMA compatible, so is not compliant to standards. However it can be on option if compiling V* proves too dificult.
Google V8	THis is the most compliant to ECMA, and the default scripting language, if available.

Default variables:

On VXML load
document.uri	URI for currently loaded VXML document
document.path	Root of URI
Recoding element
{name}$.type	MIME type for recording output
{name}$.uri	URI for recording output
{name}$.maxtime	Boolean flag for recording hit maximum time
{name}$.termchar	Value used if recording ended by termination character
{name}$.duration	Duration of the recording
{name}$.size	Size in bytes of the recording
Transfer element
{name}$.duration	Duration of transfer operation
When executed from OPAL call
session.time	Wall clock time of call start
session.connection.local.uri	Local party URI
session.connection.local.dnis	Called party number
session.connection.remote.ani	Calling party number
session.connection.remote.uri	Remote party URI
session.connection.remote.ip	Remote party media IP address
session.connection.remote.port	REmote party media port numner
session.connection.calltoken	Call token (OPAL internal)