Limitations of Google Dialogflow

The following are the limitations of Google Dialogflow support:

Google Dialogflow recognition does not support VXML grammars within Event Handler and Application Root documents.
Only a single VXML grammar for Google Dialogflow can be in VXML scope at any one time within an application.
Google Dialogflow does not support standard grammars specifications such as SRGS or SISR.
Experience Portal supports one Google account per application since the credentials are specified there.
Unlike grammar specifications such as SRGS, a grammar for Google Speech cannot specify a variable to be assigned the recognition result.
In Dialogflow reporting, def_dialogflow.vxml builds dynamic VXML pages in order to interact with Dialogflow. This means that the VoiceXMLLoad event is listed but does not display the Dynamic VXML.