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

# Delete SIP trunk

> Delete a SIP trunk and clean up voice infrastructure

Deletes a SIP trunk and removes the associated inbound and outbound trunks from the voice infrastructure.

This uses the same endpoint as releasing any phone number. For SIP trunks, the deletion is immediate (no billing period).

<Note>
  See [Release phone number](/api-reference/phone-numbers/release-phone-number) for the full endpoint documentation. SIP trunks are immediately deleted and return `"Phone number deleted successfully."`.
</Note>

### Path Parameters

<ParamField path="id" type="integer" required>
  The unique identifier of the SIP trunk to delete
</ParamField>

### Response

<ResponseExample>
  ```json 200 Deleted theme={null}
  {
    "message": "Phone number deleted successfully."
  }
  ```

  ```json 404 Not Found theme={null}
  {
    "error": "Phone number not found."
  }
  ```
</ResponseExample>

### What happens on deletion

When you delete a SIP trunk:

* **Inbound and outbound trunks** are removed from the voice infrastructure
* Any **assistants** using this SIP trunk will have their phone number unassigned
* Any **campaigns** using this number will have it removed from rotation
* **Call history** is preserved and remains accessible