VoiceXML is used to create IVR applications in PBX solutions and other applications.

From the W3C Candidate Recommendation document:

Hello World example :
<?xml version="1.0"?>
<vxml version = "2.0" xmlns="http://www.w3.org/2001/vxml">
<form>
<block>Hello world!</block>
</form>
</vxml>

See Also

VoiceXML Standard links:

• Voice XML Forum

VoiceXML Developer sites:

• Voximal Wiki – Online VoiceXML tutorial and documentations.
• Voximal Examples – Online VoiceXML services, examples and test suite.
• SpeakRight Framework open source framework for writing VoiceXML applications in Java
• Tellme is also involved with an Asterisk/Voice application partnership, See Tellme for more info.
• Voxbuilder
• Voicent VoiceXML Gateway Developer Network
• Plum Voice Developer Site provides access to free developer accounts and Voicexml Tutorials

VoiceXML Platform links:

• IVRPowers – VoiceXML IVR Platforms
• Voximal – VoiceXML interpreter for Asterisk/Linux. Cloud and package installation, and web interface (freePBX) – ulex.fr
• Angel.com IVR – supports VoiceXML designed though an easy to use web interface – SiteBuilder
• Cosmos VoXML Application Platform – High performance Service Delivery Platform (SDP) from Cosmact, supports CCXML and VoXML/VoiceXML
• Database Systems Corp. IVR and Voice broadcasting Phones with IVR VoiceXML and VoiceXML Messaging .
• IfByPhone.com – VoiceXML, IVR, FindMe, Automated Surveys, and more configured through a really simple website – http://www.ifbyphone.com/
• IVRPowers – Cloud Hosting VoiceXML IVR PaaS
• OpenVXI: Open Source VoiceXML application
• Voicent Gateway, see VoiceXML Gateway from Voicent for more info.
• Voxeo VoiceCenter IVR – supports VoiceXML, CCXML, SSML, SRGS, ENUM and SIP standards.
• VXML 2.1 + GUI Tools IEC – SIP/2.0+VXML 2.1 Inexpensive IVR Platform/Browser with Conferencing, Cloud/MRCP ASR/TTS, Linux/Windows, Call Analysis, Outbound, more … Free Trial Download.
• Sibilo Voice – Sibilo Voice is an Interactive Voice Response (IVR) of the latest generation. It natively incorporates functionality for developing voice portals in the VXML language.
• Message Technologies Messagtech (MTI) IVR – VoiceXML compliant Hosted IVR platform. With over 18 years of experience, we’re a complete IVR service provider.
• Plum Voice: VoiceXML certified platform.

VoiceXML Hosting links:

• EasyIVR – provides hosted Interactive Voice Response (IVR) and voice broadcasting service supporting VoiceXML connectivity.
• ICOA.com – a provider of hosted on-demand Auto-Attendendant and custom API solutions also providing custom VoiceXML Application Hosting
• IfByPhone.com – a provider of hosted on-demand IVR, FindMe, SurVo, and custom API solutions
• IVRPowers.com – IVR VoiceXML 2.1 Cloud Hosted PaaS or SaaS – http://www.ivrpowers.com/
• Reminder Service – hosted center for call reminders using VoiceXML messaging.
• Voxeo VoiceCenter IVR – supports VoiceXML, CCXML, SSML, SRGS, ENUM and SIP standards.
• Messagtech (MTI) – VoiceXML compliant Hosted IVR provider using best-of-breed IVR technology. With over 18 years of experience, we’re a complete IVR service provider.
• Plum Voice – a provider of hosted IVR solutions.
• Voximal provides VoiceXML applications developement and hosting – Voximal Cloud VoiceXML servers with TTS/ASR/STT.
• Telecallmart.com All in one Voice Portal with DID numbers from 60+ countries and more, integrated with cloud and hosted IVR with VouceXML support via REST API.

VoiceXML Development and Hosting in any country

• Voximal provides VoiceXML applications developement and hosting – Voximal Cloud VoiceXML servers with TTS/ASR/STT, Run over AWS, Azure, OVH and use most of TTS/STT Cloud APIs..

VoiceXML Hosting in Germany:

• woopla VoiceXML Gateway – VoiceXML Gateway accessible worldwide, SIP-transfers allowed, personal access numbers for your company in 40+ countries

VoiceXML Hosting in Brazil:

• LocawebTelecom offers hosting solutions for VoiceXML applications in Brazil.

VoiceXML Hosting in Australia and the United Kingdom:

• Delacon UK or Delacon Australia offers hosting solutions for VoiceXML – Touchtone and Speech Recognition based applications on a Nuance and Asterisk platform using either Dialogic/VOIP/SIP or IAX.
• I-Net UK London based I-Net communications is a fully converged 21 CN operator providing PSTN and IP based telephony services to a broad customer base, ranging from blue chip organisations, call centres, VoiceXML.

Interesting VoiceXML Resources

• Specialty Answering Service VXML Infographic Infographic explaining what is VoiceXML, introduces the technology, vxml gateways, specs, applications, and vxml examples from the call center industry.