The voiceglue project is an attempt to create a free implementation of VoiceXMML 2.0 with as many VoiceXML 2.1 additions as possible.

Our goal is to first implement all of the required features of the 2.0 specification http://www.w3.org/TR/voicexml20/ though some optional 2.0 features and extra features from the 2.1 specification http://www.w3.org/TR/voicexml21/ have already made it in due to their usefulness or ease of implementation.

As of voiceglue 0.11, we have not yet achieved a full 2.0 implementation. But we're getting close.

This is not an exhaustive list, but hits most of the major points.

• Full HTTP document fetching, parsing, and syntax support
• Full javascript (ECMAscript) processing
• Parameter passing from Asterisk
• Cookie support
• Pre-recorded HTTP audio fetching and output
• TTS output (minus SSML markup)
• Audio recording and retrieval
• DTMF input with simple SRGS XML grammars
• Primitive blind transfer support
• The data tag from VXML 2.1

These are the major required VXML 2.0 features not present in voiceglue 0.11:

• ASR (user input is DTMF only)
• Full SSML support in TTS
• Fully general SRGS XML DTMF grammars

Voiceglue 0.11 is primarily a bug fix release. The major bugs fixed are:

• Fix file handle management bug
• Re-add gsm audio support
• Fix bargein handling