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The following are the limitations of Google Speech support:
Google Speech recognition does not support VXML grammars within Event Handler and Application Root documents.
Only a single VXML grammar for Google Speech can be in VXML scope at any one time within an application.
Google Speech does not support DTMF recognition. Therefore, a grammar cannot be defined for Google with a mode of dtmf. Hence, Google Speech does not support the remote DTMF processing feature of Experience Portal.
Google Speech does not support standard grammars specifications such as SRGS or SISR.
Only a single Google account is supported per Experience Portal deployment.
Unlike grammar specifications such as SRGS, a grammar for Google Speech cannot specify a variable to be assigned the recognition result.
Google Speech integration supports some of the Generic Speech Recognizer Properties defined in the VoiceXML specification such as confidencelevel, completetimeout, incompletetimeout, and maxspeechtimeout. All other properties such as sensitivity and speedvsaccurracy are not supported with Google Speech recognition.
Google Speech has a maximum speech silence timeout of 10 seconds. Therefore, any relevant VXML timeout properties that are configured higher than this value will be overridden.