I have a comprehensive SIP based call flow and trying to pass two FromExtVXML0 and FromExtVXML1 ECC variables to the ICM using Subdialog Return CVP element in Cisco Unified CVP VXMLStudio. Only at times, I get an error at the Subdialog Return element as mentioned here -
Otherwise it was always successful. Here I am not looking for any external media files/grammars. Please let me know how to resolve this issue which occurs at specific times.