VAPI•8h ago

End Call Tool Message Not Playing

Hi all, I have been having trouble getting my VAPI assistants to consistently say the end call message.

I've tried adding the end call as the follwing, and it seems its always very inconsistent in actually saying the message.

within my prompt, Ive included an end call message in the #call closing section
to the "endCallMessage" field on the assistant
as a message on the end_call_tool, ive tried with request complete with 'End the call after message is spoken'

In the call Id below, i DO see a voice log with my end call message near the very end of the call, but it seems the 'Vapi voice WebSocket disconnected'. it looks like the voice socket gets disconnect before it can actually say the message?

Call Id: 019b390b-3420-7776-bc9d-6a25af194eef
Org Id: 211c53bc-1b1f-4efb-97f2-4f2cbde0da50

VapiAPP•12/21/25, 12:51 AM

Hi there,

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Customer Support Team

Vapi Support BotAPP•12/21/25, 12:52 AM

To help ensure your end call message is played, set the endCallMessageendCallMessage field directly in your assistant configuration and make sure the call flow allows time for the message to finish before disconnecting. For example:

{
  "endCallMessage": "Thank you for calling. Goodbye!"
}

{
  "endCallMessage": "Thank you for calling. Goodbye!"
}

After updating, monitor your call logs in the dashboard to verify the message is spoken before the WebSocket disconnects. This approach is recommended in the API Reference documentation.

Source:

API Reference documentation

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

Pprimary-violet Hi all, I have been having trouble getting my VAPI assistants to consistently sa...

unexpected-ivory•12/21/25, 8:16 AM

This looks like a timing issue where the call ends before TTS finishes playing.
Even though the end message appears in the logs, the voice WebSocket disconnects too early.
Best practice is to use one closing method (preferably end_call_tool) and ensure “end call after message is spoken” is enabled, with no other logic ending the call.
Quick check: do you have any timeouts, webhooks, or client-side logic that might be closing the call immediately after the tool fires?
@randomreaper

End Call Tool Message Not Playing

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