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Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt

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This guide shows how to integrate Vapi with Vobiz using the dashboard. By the end, you’ll be able to make outbound calls and receive inbound calls with your Vapi AI assistant - without writing any code.
Prefer using API/CLI? Check out the API setup guide for curl commands and programmatic integration.

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What you’ll build

An end-to-end voice integration where your Vapi AI assistant can place outbound calls through Vobiz SIP trunking and answer inbound calls placed to your Vobiz number.

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Prerequisites

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Outbound calls

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Step 1: Create SIP trunk credentials in Vapi

1

Open Vapi integrations

Log in to the Vapi Dashboard, click Integrations in the sidebar, then navigate to SIP Trunk Credentials.
2

Add a new credential

Click Add New Credential and name your trunk (for example, Vobiz Trunk).
3

Add gateway URL

Enter your Vobiz SIP domain from the Vobiz Console (for example, bfab10fb.sip.vobiz.ai).
4

Add credentials

Enter the username and password from your Vobiz trunk, enable outbound calling, and click Save.
Copy your unique credentials from the Authentication & Linking section of your trunk:
FieldExample value
Gateway URL (SIP Domain)<your_unique_domain>.sip.vobiz.ai
Username<your_username>
Password<your_password>

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Step 2: Get Vobiz SIP credentials

From the Vobiz Console:
  1. Log in to the Vobiz Console.
  2. Go to SIP Trunk → Outbound Trunks → Trunks.
  3. Select your trunk.
  4. Scroll down to the Authentication & Linking section.
  5. Copy the SIP Domain, Username, and Password.
Don’t have a Vobiz trunk yet? See the SIP trunks documentation to create one.

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Step 3: Import your phone number

1

Open phone numbers

In the Vapi Dashboard, go to Phone Numbers and click Add Number.
2

Choose BYO SIP trunk

Select BYO SIP Trunk Number.
3

Enter your Vobiz number

Enter your Vobiz number (for example, 08071387149).
4

Pick the credential

Under SIP Trunk Credentials, pick the credential you created in Step 1, label it (for example, Vobiz Main Line), and click Import SIP Trunk Number.
Need a phone number? See the phone numbers documentation to purchase one from Vobiz.

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Step 4: Make an outbound call

1

Start a new call

In the Vapi Dashboard, click Make a Call or go to Phone Calls → New Call.
2

Configure outbound settings

Open Outbound Settings, enter the destination number (for example, +919148223344), select your assistant, and select your imported Vobiz number as the caller ID.
3

Place the call

Click Make Outbound Call. The call will initiate and your Vapi assistant will speak when the recipient answers.
Outbound integration complete! Your Vapi assistant can now make outbound calls through Vobiz SIP infrastructure.

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Step 5: Configure call transfer (optional)

To let the AI agent transfer calls to a human agent, configure the Transfer Call tool.
  1. In the Vapi Dashboard, navigate to the Tools section.
  2. Click Create Tool and select Transfer Call from the dropdown.
  3. Phone Number: enter the destination in E.164 format (for example, +919876543210).
  4. Transfer Mode: select Blind Transfer.
  5. Click Create Destination or Save to confirm.
Blind Transfer forwards the call immediately without the AI announcing the caller.

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Inbound calls

Receive calls placed to your Vobiz number and route them to your Vapi AI assistant. 
Caller dials Vobiz number → Vobiz SIP → Vapi SIP trunk → Vapi AI assistant

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Step 1: Create an inbound SIP trunk in Vapi

1

Open SIP trunk settings

In the Vapi Dashboard, click More → Integrations in the sidebar, then navigate to SIP Trunk and click Create New SIP Trunk.
2

Configure the trunk

Name the trunk (for example, Vobiz Inbound Trunk) and add the gateway IP 13.233.44.61.
3

Set inbound-only options

Check Allow Inbound Calls, set Port 5060, Netmask 32, Protocol UDP, uncheck Outbound Calls, then click Save.
SettingValue
Gateway IP13.233.44.61
Port5060
Netmask32
ProtocolUDP
Inbound callsEnabled
Outbound callsDisabled
Want both inbound and outbound on the same trunk? Click Add Another Gateway and add a second gateway with your Vobiz SIP domain and credentials for outbound calls.

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Step 2: Get the Vapi trunk ID

After saving the trunk in Vapi, you need the Trunk ID to configure Vobiz. The Trunk ID is only available via the Vapi API. 
curl -X GET "https://api.vapi.ai/credential" \
  -H "Authorization: Bearer YOUR_VAPI_API_KEY"
Find the trunk in the response that matches your inbound trunk name: 
{
  "id": "46deea29-645d-44a3-bf42-7c6ec2d4b65c",
  "orgId": "0c147555-d9bc-41ff-8c89-82eca29f891c",
  "provider": "byo-sip-trunk",
  "gateways": [
    {
      "ip": "13.233.44.61",
      "outboundEnabled": false
    }
  ],
  "name": "Vobiz Inbound Trunk"
}
Copy the id field - this is your Trunk ID. Look for the entry with gateway IP 13.233.44.61 and outboundEnabled: false.

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Step 3: Create an inbound trunk in the Vobiz Console

1

Open inbound trunks

Log in to the Vobiz Console and go to SIP Trunks → Inbound Trunk.
2

Create the trunk

Click Create New Trunk, name it (for example, Vapi Inbound), and set Transport to UDP.
3

Set the primary URI

Set Primary URI to <VAPI_TRUNK_ID>.sip.vapi.ai - for example, 46deea29-645d-44a3-bf42-7c6ec2d4b65c.sip.vapi.ai.
4

Link your number

Link your Vobiz phone number to this trunk and click Save.

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Step 4: Import the phone number in Vapi

  1. In the Vapi Dashboard, go to Phone Numbers in the sidebar.
  2. Click Create Phone Number.
  3. Select BYO SIP Trunk Number.
  4. Enter your Vobiz phone number (for example, +918071387376).
  5. In SIP Trunk Credential, select the inbound trunk you created in Step 1.
  6. Label it (for example, Vobiz Inbound Line) and click Import SIP Phone Number.

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Step 5: Assign assistant and test

  1. On the phone number you just imported, scroll to Inbound Settings.
  2. Under Select Assistant, choose your Vapi AI assistant.
  3. Click Save.
  4. Test it - dial your Vobiz number from any phone. Your AI assistant should answer.
Inbound setup complete! Calls to your Vobiz number now route to your Vapi AI assistant automatically.

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Troubleshooting

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Call doesn’t connect

  • Verify SIP domain, username, and password are correct in the Vobiz Console.
  • Use the exact sip_domain (for example, bfab10fb.sip.vobiz.ai), not a generic sip.vobiz.ai.

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Assistant doesn’t speak

  • Verify the assistant has a First Message configured.
  • Check the assistant has a voice provider set up correctly.
  • View call logs in the Vapi Dashboard → Calls for errors.

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Phone number format error

  • Use E.164 format: +919148223344 (with +).
  • Or local format: 09148223344 (without +).
  • Verify the number is active in the Vobiz Console.
Need more detail? See the API troubleshooting guide for additional error scenarios.

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Next steps

  • Customize your assistant - configure voice, personality, and responses in the Vapi Dashboard.
  • View call analytics - monitor call logs, transcripts, and metrics in Vapi Dashboard → Calls.
  • Automate with API - see the Vapi API setup guide to trigger calls programmatically.
  • Monitor usage - track your Vobiz balance and call records.