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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.
URL
https://console.vobiz.ai/app/sip/out/trunks

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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
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

FieldMeaning
Trunk NameFriendly label. Edit any time via the pencil icon.
Trunk IDImmutable UUID. Use this as trunk_id in REST API calls.
StatusToggle to enable/disable the trunk without deleting it. A disabled trunk rejects all SIP traffic instantly.
SIP DomainThe hostname your PBX points its INVITEs at (e.g. 39a32383.sip.vobiz.ai). One per trunk - never shared.

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Recording & Transcription toggles

Four togglable features, all per‑trunk:
FeatureWhat it does
Call RecordingRecords every call on this trunk to WAV (default) or MP3. Retention is 30 days; export historical recordings via the Recording API for longer storage.
AI TranscriptionGenerates speaker‑labelled transcripts plus sentiment scoring. Requires Call Recording.
PII RedactionMasks 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 WebhookPOSTs a notification to a URL when each recording is ready for download. Useful for hooking recordings straight into your storage pipeline.

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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
SectionFieldNotes
Trunk NameRequiredA friendly label.
Recording & TranscriptionCall RecordingMaster switch. Other recording toggles are greyed until this is on.
Recording WebhookNotification on each new recording.
AI TranscriptionAuto‑transcribe + sentiment. Requires recording.
PII RedactionMask PII in audio and transcripts. Requires transcription.
Authentication & LinkingCredentials ListPick an existing credential set, or click + Create New Credential to make one inline.
IP Access Control ListPick 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 URLReceive 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.

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Pointing your PBX

Once the trunk is created: 
SIP Server / Domain:  <trunk-id>.sip.vobiz.ai
Port:                 5060 (UDP) or 5061 (TLS)
Username:             <credential username>      (credential auth)
Password:             <credential password>      (credential auth)
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.