VAPI•7mo ago

Transfer call error: call.in-progress.error-vapifault-worker-died

Transfer call error: call.in-progress.error-vapifault-worker-died

I have transfer_call_tool in the vapi, now every time the assistant is going to transfer the call I am encountering ang error:

Here is the error when I go to the call log:
An error occurred in this call: call.in-progress.error-vapifault-worker-died

Please help!

Vapi Support BotAPP•6/4/25, 2:22 PM

Thanks for sharing the error details. To help diagnose the issue, could you please confirm whether you are using a custom server URL for dynamic call transfers, and if so, is your server responding with a valid destinationdestination or errorerror as required by the Vapi documentation?
This will help determine if the error is due to a misconfiguration in the transfer tool or an issue with the server response.

If you need immediate assistance, you can also contact Vapi Support with your call ID and account email.

Sources:

⤵️ Mention @Vapi Support Bot for follow-ups 🐥

yummy-tealOP•6/4/25, 2:43 PM

Hello, no I am not using any, I am just using the simple transfer call in vapi

Assistant > Tools > Predefined Functions

Then input the phone number destination in E.164 format

VapiAPP•6/5/25, 12:59 AM

Hey! To help track down this issue, could you share:

The call IDThis would really help us figure out what went wrong!

yummy-tealOP•6/5/25, 2:54 PM

Here are the sample call ids:

a8e076b5-a931-4b4c-85eb-ff1f8dfd2248
54dc847f-062a-416f-8cb3-16ed4f6761c8
5c0498f8-b61e-4341-8470-56bcc5b5e796
f5c0ce67-68cf-48b9-a071-a9bdbf86e709

There are a lot of trials

VapiAPP•6/6/25, 12:59 AM

Hey, this issue was on our side where a few of our workers died. Now you can try again, and you won't be getting this issue again. It's a rare issue which only happens if, at an uncertain point of time, there is an unexpected spike of requests.

forward-apricot•6/12/25, 9:08 AM

I just had the same issue on two separate calls @Shubham Bajaj so it seems it's not fixed yet. Example:
6a8fafb4-fe6d-4474-88bb-52804788820e
7cdcdd66-c4b1-4d33-90e0-673f518884ba

VapiAPP•6/13/25, 1:07 AM

Hey Floris, thanks for sharing the call_ids let me check with the team what can be done.

Transfer call error: call.in-progress.error-vapifault-worker-died

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