FAQ: Why do calls disconnect when routed to an inbound call flow?
Automatic speech recognition (ASR) is enabled by default for the starting menu of new call flows. If no ASR terms are defined on the starting menu, the system can disconnect the caller. To prevent unintentionally disconnecting callers, define valid ASR terms for the menu options or override ASR for the call flow. See Basic steps to design a flow and Set up the starting menu.