Skip to content

Optimize webhook response time #678

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Sep 11, 2025
Merged

Optimize webhook response time #678

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
c15fbde
Docs: Add assistant-request webhook timeout warning
cursoragent Sep 11, 2025
f5552c3
Fix webhook timeout description
cursoragent Sep 11, 2025
3ad1124
Fix: Clarify webhook timeout reasons
cursoragent Sep 11, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 8 additions & 0 deletions fern/server-url/events.mdx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,14 @@ For inbound phone calls, you can specify the assistant dynamically. If a PhoneNu
}
```

<Note>
You must respond to the `assistant-request` webhook within <strong>7.5 seconds end-to-end</strong>. This limit is fixed and not configurable: the telephony provider enforces a 15-second cap, and Vapi reserves ~7.5 seconds for call setup. The timeout value shown elsewhere in the dashboard does not apply to this webhook.

To avoid timeouts:
- Return quickly with an existing <code>assistantId</code> or a minimal assistant, then enrich context asynchronously after the call starts using <a href="/calls/call-features">Live Call Control</a>.
- Host your webhook close to <code>us-west-2</code> to reduce latency, and target &lt; ~6s to allow for network jitter.
</Note>

Respond with either an existing assistant ID, a transient assistant, or transfer destination:

```json
Expand Down
Loading