> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nixflex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Pre-call gate

> Screen or route calls before the AI answers - per phone number or per agent.

Set a pre-call webhook that Nixflex calls before the AI answers, so you can screen or route the call. Configured **per phone number** (or per agent).

## Set the pre-call webhook (per number)

<ParamField path="phoneNumber" type="string" required>
  The phone number in E.164 format, passed in the URL.
</ParamField>

<ParamField body="url" type="string" required>
  Your pre-call webhook endpoint. Must be an `https` URL.
</ParamField>

```bash theme={null}
curl -X PUT "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://your-app.com/precall"}'
```

## Per agent

The same shape is available per agent at `/integrations/precall/agent/:agentId`.

## Check / remove

```bash theme={null}
curl -X GET "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"

curl -X DELETE "https://api.nixflex.com/v1/integrations/precall/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"
```

## Notes

* The number must belong to your account. A number you do not own returns `404`.
* For how the pre-call gate works, see [Pre-call gate](/advanced/precall-gate).