> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Update a Trunk
> Modify an existing Vobiz SIP trunk - update name, description, concurrent-call limits, CPS caps, or webhook URL without recreating the trunk resource.
```http theme={null}
PUT https://api.vobiz.ai/api/v1/Account/{auth_id}/trunks/{trunk_id}
```
Use this endpoint to update the configuration of an existing trunk. You can modify the name, description, and rate limits. Include only the fields you want to update; other fields will remain unchanged.
**Authentication required:**
* `X-Auth-ID` - Your account Auth ID
* `X-Auth-Token` - Your account Auth Token
* `Content-Type: application/json`
**Note:** `trunk_id` and `auth_id` cannot be changed after creation.
## Request Parameters
Send all three fields on every update - this is a replace, not a partial patch. To keep a value unchanged, resend its current value (fetch it first with [Retrieve a Trunk](/trunks/retrieve-trunk)).
| Field | Type | Required | Description |
| ---------------------- | ------- | -------- | ----------------------------------------------------------------------------------------------- |
| `name` | string | Yes | Name for the trunk. Maximum 255 characters. |
| `max_concurrent_calls` | integer | Yes | Maximum number of simultaneous calls. Surfaces as `concurrent_calls_limit` on the trunk object. |
| `enabled` | boolean | Yes | Whether the trunk is active. Set to `false` to disable without deleting. |
## Examples
```bash cURL - Rename the trunk theme={null}
curl -X PUT https://api.vobiz.ai/api/v1/Account/{auth_id}/trunks/bfab10fb-cb97-488b-9c63-989c32980b0f \
-H "X-Auth-ID: YOUR_AUTH_ID" \
-H "X-Auth-Token: YOUR_AUTH_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"name": "Updated Production Trunk",
"max_concurrent_calls": 10,
"enabled": true
}'
```
```bash cURL - Disable the trunk theme={null}
curl -X PUT https://api.vobiz.ai/api/v1/Account/{auth_id}/trunks/bfab10fb-cb97-488b-9c63-989c32980b0f \
-H "X-Auth-ID: YOUR_AUTH_ID" \
-H "X-Auth-Token: YOUR_AUTH_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"name": "Acme Production Trunk",
"max_concurrent_calls": 10,
"enabled": false
}'
```
```bash cURL - Raise the concurrent-call limit theme={null}
curl -X PUT https://api.vobiz.ai/api/v1/Account/{auth_id}/trunks/bfab10fb-cb97-488b-9c63-989c32980b0f \
-H "X-Auth-ID: YOUR_AUTH_ID" \
-H "X-Auth-Token: YOUR_AUTH_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"name": "Acme Production Trunk",
"max_concurrent_calls": 25,
"enabled": true
}'
```
## Response
Returns the complete trunk object with updated values and a new `updated_at` timestamp.
```json Response - 200 OK theme={null}
{
"trunk_id": "aabbccdd-1234-5678-90ab-cdef12345678",
"account_id": "MA_XXXXXXXX",
"name": "Acme Production Trunk",
"trunk_domain": "aabbccdd-1234-5678-90ab-cdef12345678.sip.vobiz.ai",
"trunk_status": "active",
"secure": false,
"trunk_direction": "both",
"concurrent_calls_limit": 10,
"cps_limit": 2,
"description": "",
"transport": "udp",
"recording": false,
"enable_transcription": false,
"pii_redaction": false,
"webhook_method": "POST",
"recording_webhook_enabled": false,
"created_at": "2026-05-12T05:11:52.054462Z",
"updated_at": "2026-05-12T05:12:18.147340Z"
}
```
**Best Practice:** Disable a trunk instead of deleting it if you might need the configuration later. Disabled trunks do not handle calls but preserve all settings, credentials, and routing rules.
## OpenAPI
````yaml PUT /api/v1/Account/{auth_id}/trunks/{trunk_id}
openapi: 3.0.3
info:
title: Vobiz API
description: >
The Vobiz API lets you make calls, manage phone numbers, configure SIP
trunks,
and access account data programmatically.
**Base URL:** `https://api.vobiz.ai`
**Authentication:** All requests require `X-Auth-ID` and `X-Auth-Token`
headers.
Obtain these from your [Vobiz Console](https://console.vobiz.ai).
version: '1.0'
contact:
email: support@vobiz.ai
url: https://vobiz.ai
servers:
- url: https://api.vobiz.ai
description: Production
security:
- AuthID: []
AuthToken: []
tags:
- name: Account
description: Manage your account details and credentials
- name: Balance
description: Retrieve balance and transaction history
- name: Calls
description: Make and manage outbound calls
- name: Live Calls
description: Retrieve and control in-progress calls
- name: CDR
description: Call detail records and history
- name: Sub-Accounts
description: Create and manage sub-accounts
- name: Phone Numbers
description: Manage phone numbers on your account
- name: Trunks
description: Configure SIP trunks for inbound and outbound calling
- name: Conference
description: Manage conference calls and members
- name: Applications
description: Manage voice and messaging applications with webhook URLs
- name: Endpoints
description: Manage SIP endpoints for IP phones, softphones, and SIP clients
- name: Partner API
description: >-
Reseller and white-label endpoints for managing customer sub-accounts,
balance transfers, transactions, CDRs, and DIDs across your partner
ecosystem
- name: Sub-Account KYC
description: >-
Per-sub-account KYC verification (PAN, GST, CIN, Aadhaar, DigiLocker) and
hosted email/redirect KYC sessions. Authenticated as the parent main
account.
- name: Sub-Account KYC (Test Mode)
description: >-
Mock KYC endpoints that never call the upstream provider. Drive verified /
failed / pending / error outcomes with magic inputs for integration
testing.
paths:
/api/v1/Account/{auth_id}/trunks/{trunk_id}:
put:
tags:
- Trunks
summary: Update a trunk
description: Update a SIP trunk's name, configuration, or status.
operationId: update-trunk
parameters:
- $ref: '#/components/parameters/AuthId'
- name: trunk_id
in: path
required: true
schema:
type: string
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
name:
type: string
max_concurrent_calls:
type: integer
enabled:
type: boolean
required:
- name
- max_concurrent_calls
- enabled
responses:
'200':
description: Trunk updated
content:
application/json:
schema:
type: object
properties:
trunk_id:
type: string
account_id:
type: string
name:
type: string
trunk_domain:
type: string
trunk_status:
type: string
secure:
type: boolean
trunk_direction:
type: string
concurrent_calls_limit:
type: integer
cps_limit:
type: integer
description:
type: string
transport:
type: string
recording:
type: boolean
enable_transcription:
type: boolean
pii_redaction:
type: boolean
webhook_method:
type: string
recording_webhook_enabled:
type: boolean
created_at:
type: string
updated_at:
type: string
required:
- trunk_id
- account_id
- name
- trunk_domain
- trunk_status
- secure
- trunk_direction
- concurrent_calls_limit
- cps_limit
- description
- transport
- recording
- enable_transcription
- pii_redaction
- webhook_method
- recording_webhook_enabled
- created_at
- updated_at
example:
trunk_id: 99887766-1234-5678-90ab-cdef12345678
account_id: MA_XXXXXXXX
name: Acme Production Trunk Updated
trunk_domain: 99887766-1234-5678-90ab-cdef12345678.sip.vobiz.ai
trunk_status: active
secure: false
trunk_direction: both
concurrent_calls_limit: 10
cps_limit: 2
description: ''
transport: udp
recording: false
enable_transcription: false
pii_redaction: false
webhook_method: POST
recording_webhook_enabled: false
created_at: '2026-03-25T10:00:00Z'
updated_at: '2026-03-25T10:05:00Z'
components:
parameters:
AuthId:
name: auth_id
in: path
required: true
description: Your account Auth ID
schema:
type: string
example: MA_XXXXXX
securitySchemes:
AuthID:
type: apiKey
in: header
name: X-Auth-ID
description: Your Vobiz account Auth ID
AuthToken:
type: apiKey
in: header
name: X-Auth-Token
description: Your Vobiz account Auth Token
````