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This document describes Twilio's old 2008-08-01 API. See what we added in our latest revision: changelog.

TwiML TM Voice: Response Element

The root element of Twilio's XML Markup is the <Response> element. All of Twilio's verb elements must be nested within this element. Any other structure is considered invalid.

Response Element Attributes

Attribute Name Allowed Values Default Value
version Twilio version identifier your accounts default version


The version attribute tells the Twilio engine which version of the software to use to process the TwiML elements within the document. This is useful to developers who would like their application to run under a legacy version of Twilio, rather than the latest release. The current Twilio releases are:

  • 2008-08-01

Nesting Rules

The <Response> element is the top level element and may not be nested in any other verb element.

The following verbs can be nested within <Response>:


Example 1: Simple Response

<?xml version="1.0" encoding="UTF-8"?>

An simple response example with a nested <Say> verb.

Example 2: Response with version number

<?xml version="1.0" encoding="UTF-8"?>
<Response version="2008-08-01">

A response element specifying its preferred version.