Support for Industry Standards

Open Standards Promote Application Portability
and Protect Your Investment


Nuance believes strongly in open standards that don’t lock you into one vendor. Standards-based solutions offer application portability and protect your investment, and we’ve taken a leadership role in establishing standards for speech-enabled applications and communications protocols. Nuance is active with standards bodies such as the Worldwide Web Consortium (W3C) and the Internet Engineering Task Force (IETF). We are also a member of the VoiceXML forum. Over the years, we have co-authored and contributed regularly to many open standards.



VoiceXML is a language for creating telephony-based speech-user interfaces. It uses speech recognition and touchtone for input and pre-recorded audio and text-to-speech for output. It is based on the Worldwide Web Consortium's (W3C's) Extensible Markup Language (XML). The Nuance Voice Platform was one of the first three platforms certified as VoiceXML 2.1 compliant by the VoiceXML forum.

VoiceXML Certified Platform Thumbnail

VXML 2.1 standards


MRCP (Media Resource Control Protocol)

MRCP is a standard communication protocol for speech resources across VoIP networks. Nuance Recognizer and Nuance Vocalizer support both the original MRCP protocol and v2.


MRCPv2 protocol from the Internet Engineering Task Force (IETF)


Support for Open Standards

Nuance retains an editorship position for the VXML, SSML, SISR, EMMA and SRGS standards. We remain active participants in the W3C in both the Voice Browser and Multimodal Interactions Working Groups. All of our development tools generate code in standard Java and XML with no licensed runtime.

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