> ## 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.

# Get SIP trunk

> Get a single SIP trunk by ID

This endpoint returns detailed information about a specific SIP trunk, including internal trunk IDs useful for debugging.

### Path Parameters

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

### Response

<ResponseField name="data" type="object">
  The SIP trunk object

  <Expandable title="SIP trunk properties">
    <ResponseField name="id" type="integer">
      The unique identifier of the SIP trunk
    </ResponseField>

    <ResponseField name="phone_number" type="string">
      The SIP extension or phone number (DID) in E.164 format
    </ResponseField>

    <ResponseField name="nickname" type="string">
      A short, human-friendly label for the trunk (or `null` if not set)
    </ResponseField>

    <ResponseField name="sip_username" type="string">
      The username used for SIP authentication
    </ResponseField>

    <ResponseField name="sip_address" type="string">
      The SIP server address
    </ResponseField>

    <ResponseField name="sip_calling_format" type="string">
      The outbound calling number format: `+e164`, `e164`, or `national`
    </ResponseField>

    <ResponseField name="inbound_authorization_type" type="string">
      The inbound authorization method: `auth` or `ip`
    </ResponseField>

    <ResponseField name="allowed_inbound_ips" type="array">
      Array of whitelisted IP addresses (only when `inbound_authorization_type` is `ip`)
    </ResponseField>

    <ResponseField name="outbound_proxy" type="boolean">
      Whether outbound calls use a fixed proxy IP address
    </ResponseField>

    <ResponseField name="country_code" type="string">
      The ISO 3166-2 country code
    </ResponseField>

    <ResponseField name="inbound_trunk_id" type="string">
      Internal identifier for the inbound voice trunk (useful for debugging)
    </ResponseField>

    <ResponseField name="outbound_trunk_id" type="string">
      Internal identifier for the outbound voice trunk (useful for debugging)
    </ResponseField>

    <ResponseField name="created_at" type="string">
      ISO 8601 timestamp
    </ResponseField>

    <ResponseField name="updated_at" type="string">
      ISO 8601 timestamp
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseExample>
  ```json 200 Response theme={null}
  {
    "data": {
      "id": 42,
      "phone_number": "1000",
      "nickname": "Provider X — Main",
      "sip_username": "myuser",
      "sip_address": "sip.provider.com",
      "sip_calling_format": "+e164",
      "inbound_authorization_type": "auth",
      "allowed_inbound_ips": null,
      "outbound_proxy": false,
      "country_code": "US",
      "inbound_trunk_id": "ST_xxxxxxxxxxxx",
      "outbound_trunk_id": "ST_yyyyyyyyyyyy",
      "created_at": "2026-03-31T10:00:00.000000Z",
      "updated_at": "2026-03-31T10:00:00.000000Z"
    }
  }
  ```

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