So, I have specific triggers in my system prompt that tell the agent to politely say "I'm going to hang up now, thank you" and then end the call. I have "Enable End Call Function" enabled. When a trigger happens, the agent instead says, "Perfect. Your appointment has been scheduled. You'll receive a confirmation email shortly. Have a great day," even if the caller hasn't scheduled an appointment, given e-mail, or anything. I am using the best GPT models and have even tried Claude Sonnet 4 and this still persists, although sometimes this seeming glitch will happen and sometimes it won't. Any help or insight?

Try clearly separating call-ending logic in your system prompt, lowering the model temperature to 0.3, and increasing silence or join timeouts..

This didn't work. Also I tried my same system prompt and knowledge base and 11labs voice on another voice AI platform and it doesn't have this end call glitch so it seems like its something with Vapi

To help track down this issue, could you share one or two: - The call ID - When exactly this happened (the timestamp) - What response you expected to get - What response you actually got instead This would really help us figure out what went wrong!