You can handle “dead air” with Voiceflow’s built-in No-Reply timeout and then route that event to an End step so the phone hangs up automatically.
How to set it up
Open the step that puts the mic in listen mode (Capture, AI Agent, etc.).
In the right panel click Add No-Reply Response.
Pick the timeout you want (e.g. 15 s). – After that number of seconds with no speech the No-Reply port will fire.
Connect the No-Reply port → optional farewell message → End step. The End step closes the telephony session, so the call is terminated.
Want it to work everywhere? Agent Settings → Behaviour → Voice → Global No-Reply. Set a timeout and wire the No-Reply path to an End step; the rule will trigger no matter where the user goes silent.
FYI: if you do nothing, Voiceflow will still hang up after 3 minutes of total silence, but the method above lets you choose a much shorter window.
@Michael Hood (Head of Product) , I beleive that’s what he is looking for. I had the same issue where a chat agent was left unattended and opened for a while and that cost me hundreds of credits so I am interested in this feature as well.
twilio and other services will charge for 'minutes' so having the timeout is important to keep costs low. But for chat, there's no cost if the user leaves the conversation