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How voice AI systems detect call-ending ('goodbye') to stop talking

From Why can't ChatGPT Voice set a timer? | Voice AI expert explains · ≈5:02

“A lot of the sort of voice AI companies now, um, so the likes of 11 Labs, etc., etc., um, they actually build in tool calls to actively try to detect if the user is saying goodbye to end the call and then they sort of mechanically close or shut the call.”

What’s in it

Explains why voice AI calls awkwardly linger after you say goodbye
Reveals how ElevenLabs and rivals use tool calls to detect call-enders
Highlights the UX gap between mechanical call-closing and natural conversation

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Clip transcript

last turn? >> At the end of the day, they're running a running the user input in as a prompt and so it's going to spit out another bit of audio to to sort of respond to the user. A lot of the sort of voice AI companies now, um, so the likes of 11 Labs, etc., etc., um, they actually build in tool calls to actively try to detect if the user is saying goodbye to end the call and then they sort of mechanically close or shut the call. It's just it's just [laughter] so frustrating and agonizing when you just want to stop the call and the other person is still talking.