> ## 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.
# Outbound Trunks - SIP Termination from Your PBX
> Create and manage outbound SIP trunks in the Vobiz Console - IP or credential auth, per-trunk call recording, AI transcription, PII redaction, and webhooks. Walkthrough of the trunk list, trunk details, and Create Outbound Trunk form.
An **Outbound (termination) trunk** lets your PBX, soft‑switch, or AI agent place calls *out* through Vobiz to any phone number in the world. Each trunk gets its own SIP domain, its own auth choice (IP allowlist or username/password), and its own recording/transcription/redaction settings.
```text URL theme={null}
https://console.vobiz.ai/app/sip/out/trunks
```
## The Outbound Trunks list
Three columns:
1. **Search + Create** - `Search trunks…` filter and a **+ Create New Trunk** button.
2. **Trunk list** - each card shows the trunk name, ID, SIP Domain, IP ACL status, attached Credentials, and current Status badge (`Enabled` / `Disabled`).
3. **Trunk Details panel** - the right side updates when you click a card.
## The trunk details panel
| Field | Meaning |
| -------------- | ----------------------------------------------------------------------------------------------------------- |
| **Trunk Name** | Friendly label. Edit any time via the pencil icon. |
| **Trunk ID** | Immutable UUID. Use this as `trunk_id` in REST API calls. |
| **Status** | Toggle to enable/disable the trunk without deleting it. A disabled trunk rejects all SIP traffic instantly. |
| **SIP Domain** | The hostname your PBX points its INVITEs at (e.g. `39a32383.sip.vobiz.ai`). One per trunk - never shared. |
### Recording & Transcription toggles
Four togglable features, all per‑trunk:
| Feature | What it does |
| --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Call Recording** | Records every call on this trunk to WAV (default) or MP3. Retention is 30 days; export historical recordings via the [Recording API](/recording/export-historical-recordings) for longer storage. |
| **AI Transcription** | Generates speaker‑labelled transcripts plus sentiment scoring. **Requires Call Recording.** |
| **PII Redaction** | Masks names, phone numbers, emails, and other PII in both audio and transcripts. **Requires AI Transcription.** Use **+ Add entity types** to extend the redaction list. |
| **Recording Webhook** | POSTs a notification to a URL when each recording is ready for download. Useful for hooking recordings straight into your storage pipeline. |
### Configuration
The bottom card surfaces the auth wiring at a glance:
* **IP ACL** - name of the IP Access Control List attached (or `Not configured`). See [IP Access Control List](/platform/sip/ip-access-control-list).
* **Credentials** - name of the credential list attached (or `Not configured`). See [Credentials List](/platform/sip/credentials).
### Webhook
A general‑purpose webhook URL Vobiz POSTs call state events to (started, answered, ended). Click **+ Add Webhook** to configure - same payload shape as the [trunk webhook reference](/trunks/webhook).
## Create an Outbound Trunk
Click **+ Create New Trunk** to open the side panel.
| Section | Field | Notes |
| ------------------------------------ | ---------------------- | ----------------------------------------------------------------------------------------- |
| **Trunk Name** | Required | A friendly label. |
| **Recording & Transcription** | Call Recording | Master switch. Other recording toggles are greyed until this is on. |
| | Recording Webhook | Notification on each new recording. |
| | AI Transcription | Auto‑transcribe + sentiment. Requires recording. |
| | PII Redaction | Mask PII in audio and transcripts. Requires transcription. |
| **Authentication & Linking** | Credentials List | Pick an existing credential set, or click **+ Create New Credential** to make one inline. |
| | IP Access Control List | Pick an existing ACL, or click **+ Add New IP ACL** to whitelist your PBX IPs. |
| **Description (optional)** | – | Notes for your own team. |
| **Webhook Configuration (optional)** | POST URL | Receive real‑time call events for state changes. |
Use either Credentials *or* IP ACL - you don't need both. Credentials work from anywhere; IP ACL is faster (no SIP digest round‑trip) but only works from fixed source IPs.
Click **Create Trunk**. Vobiz issues the SIP Domain and you can point your PBX at it immediately.
## Pointing your PBX
Once the trunk is created:
```text theme={null}
SIP Server / Domain: .sip.vobiz.ai
Port: 5060 (UDP) or 5061 (TLS)
Username: (credential auth)
Password: (credential auth)
```
For IP auth: just dial out from the whitelisted source IP - no SIP REGISTER required.
## Edit, disable, delete
Top‑right of the details panel:
* **✏ Edit** - opens the form for changing any field except the Trunk ID.
* **Status toggle** - disable without deleting; calls are rejected instantly.
* **🗑 Delete** - permanently removes the trunk. Active calls drop.
## Tips
* **One trunk per environment.** Keep prod, staging, and dev on separate trunks so a misconfigured stage trunk can't bleed into prod metrics.
* **Recording + transcription has a billing impact.** It's worth it for AI agent flows, but expensive at carrier‑grade volumes - see the [Cost Calculator](/resources/calculator).
* **Webhook over polling.** The trunk webhook is the cheapest way to know when a recording is ready - beats polling `GET /recordings`.
## What's next
Whitelist your PBX's source IPs.
Set up SIP usernames and passwords.