Speech Application Language Tags - History

History

SALT was developed as a competitor to VoiceXML and was supported by the SALT Forum. The SALT Forum was founded on October 15, 2001 by Microsoft, along with Cisco Systems, Comverse, Intel, Philips Consumer Electronics, and ScanSoft. The SALT 1.0 specification was submitted to the W3C (World Wide Web Consortium) for review in August 2002. However, the W3C continued developing its VoiceXML 2.0 standard, which reached the final "Recommendation" stage in March 2004.

By 2006, Microsoft realized Speech Server had to support the W3C VoiceXML standard to remain competitive. Microsoft joined the VoiceXML Forum as a Promoter in April of that year. Speech Server 2007 supports VoiceXML 2.0 and 2.1 in addition to SALT. In 2007, Microsoft purchased Tellme, one of the largest VoiceXML service providers.

By that point nearly every other SALT Forum company had committed to VoiceXML. The last press release posted to the SALT Forum website was in 2003, while the VoiceXML Forum is quite active. "SALT is a direct competitor but has not reached the level of maturity of VoiceXML in the standards process," said Bill Meisel, principal at TMA Associates, a speech technology research firm.

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