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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.
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The Outbound Trunks list

Outbound Trunks page with a searchable list of trunks (Trunk1, test, PII Test, qwerty) showing ID, SIP Domain, IP ACL, Credentials, and Status, and a Trunk Details panel with Trunk Name, Trunk ID, Status toggle, Call Recording, AI Transcription, PII Redaction, Recording Webhook toggles, SIP Domain field, and a Webhook section

Outbound Trunks - list, details, and toggles

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.

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The trunk details panel

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Recording & Transcription toggles

Four togglable features, all per‑trunk:

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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.
  • Credentials - name of the credential list attached (or Not configured). See Credentials List.

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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.

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Create an Outbound Trunk

Click + Create New Trunk to open the side panel.
Create Outbound Trunk side panel with Trunk Name required field, Recording and Transcription section with toggles for Call Recording, Recording Webhook, AI Transcription, and PII Redaction (each with Enable recording first / Enable transcription first prerequisite hints), Authentication and Linking section with Credentials List dropdown and IP Access Control List dropdown plus Create New Credential and Add New IP ACL links, optional Description, and Webhook Configuration with POST method and URL placeholder

Create Outbound Trunk form

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.

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Pointing your PBX

Once the trunk is created:
For IP auth: just dial out from the whitelisted source IP - no SIP REGISTER required.

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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.

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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.
  • Webhook over polling. The trunk webhook is the cheapest way to know when a recording is ready - beats polling GET /recordings.

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What’s next

IP Access Control List

Whitelist your PBX’s source IPs.

Credentials List

Set up SIP usernames and passwords.