Vapi integration (dashboard)

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.

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.

Prerequisites

Vobiz account with a SIP trunk → Create account
Vapi account → Sign up
Vapi assistant created → Create in dashboard
Phone number from Vobiz (for caller ID)

Outbound calls

Step 1: Create SIP trunk credentials in Vapi

Open Vapi integrations

Add a new credential

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

Add gateway URL

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

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:

Field	Example value
Gateway URL (SIP Domain)	`<your_unique_domain>.sip.vobiz.ai`
Username	`<your_username>`
Password	`<your_password>`

Step 2: Get Vobiz SIP credentials

From the Vobiz Console:

Log in to the Vobiz Console.
Go to SIP Trunk → Outbound Trunks → Trunks.
Select your trunk.
Scroll down to the Authentication & Linking section.
Copy the SIP Domain, Username, and Password.

Don’t have a Vobiz trunk yet? See the SIP trunks documentation to create one.

Step 3: Import your phone number

Open phone numbers

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

Choose BYO SIP trunk

Select BYO SIP Trunk Number.

Enter your Vobiz number

Enter your Vobiz number (for example, 08071387149).

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.

Step 4: Make an outbound call

Start a new call

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

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.

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.

Step 5: Configure call transfer (optional)

To let the AI agent hand a call off to a human, add a Transfer Call tool and give it a destination. You can transfer to a plain phone number, or - to route the transfer out through your Vobiz trunk - to a SIP destination.

Create the transfer tool

In the Vapi Dashboard, open Tools, click Create Tool, and select Transfer Call (transferCall). Attach the tool to your assistant.

Add a destination

In the tool’s Destinations section, click Add Destination and choose SIP (or Phone Number for a simple PSTN transfer).

Set the SIP URI

For a SIP destination, set the SIP URI to the destination number at your Vobiz trunk domain:

sip:+91XXXXXXXXXX@<your-trunk>.sip.vobiz.ai

Replace +91XXXXXXXXXX with the E.164 number to transfer to, and <your-trunk> with your Vobiz SIP domain - for example sip:+919876543210@abc123.sip.vobiz.ai.

Save

Optionally add a Message to Customer (played before the transfer connects), then save.

Destination type	When to use	Value
SIP	Route the transfer through your Vobiz trunk	`sip:+91XXXXXXXXXX@<your-trunk>.sip.vobiz.ai`
Phone Number	Simple blind transfer to a PSTN number	E.164, e.g. `+919876543210`

The SIP destination sends the transferred leg to <your-trunk>.sip.vobiz.ai, so it’s carried over your Vobiz SIP trunking - the same domain you use for your other Vobiz trunks. Get your SIP domain from Vobiz Console → SIP Trunk → your trunk → Authentication & Linking.

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

Step 1: Create an inbound SIP trunk in Vapi

Vobiz sends inbound SIP from any of its signaling IPs, so you must add every Vobiz SIP signaling IP as a gateway. If you whitelist only one, calls that arrive from a different Vobiz IP are rejected.

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. Name it (for example, Vobiz Inbound Trunk).

Configure Gateway #1

In Gateway #1, set IP Address / Domain to the first Vobiz SIP signaling IP, Port 5060, Netmask 32, and Outbound Protocol UDP. Check Allow inbound calls; leave Allow outbound calls and Enable options ping unchecked.

Add a gateway for every Vobiz SIP signaling IP

Click Add Another Gateway and repeat the same settings (Port 5060, Netmask 32, UDP, Allow inbound calls) for each remaining Vobiz SIP signaling IP - so all of them are whitelisted.

Save

Click Save. You should end up with one gateway per Vobiz SIP signaling IP (10 at the time of writing), each shown as udp · inbound.

Use these settings for every gateway:

Setting	Value
Port	`5060`
Netmask	`32`
Outbound Protocol	`UDP`
Allow inbound calls	Enabled
Allow outbound calls	Disabled
Enable options ping	Disabled

Add one gateway for each Vobiz SIP signaling IP:

Vobiz SIP signaling IPs

203.7.132
2.100.211
126.98.234
235.11.131
233.44.61
111.255.163
111.128.110
204.64.203
207.232.91
154.133.28

These IPs can change. Always confirm the current list on IP whitelisting → SIP signaling and keep your Vapi gateways in sync.

Want outbound on the same trunk? Add another gateway with your Vobiz SIP domain and credentials and enable Allow outbound calls - or use the dedicated outbound credential from the Outbound calls section above.

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": "13.203.7.132", "outboundEnabled": false },
    { "ip": "65.2.100.211", "outboundEnabled": false },
    { "ip": "13.126.98.234", "outboundEnabled": false }
    // ... one entry per Vobiz SIP signaling IP
  ],
  "name": "Vobiz Inbound Trunk"
}

Copy the id field - this is your Trunk ID. Find the entry whose name matches your inbound trunk; its gateways array should list every Vobiz SIP signaling IP you added, each with outboundEnabled: false.

Step 3: Create an inbound trunk in the Vobiz Console

Open inbound trunks

Create the trunk

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

Set the primary URI

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

Link your number

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

Step 4: Import the phone number in Vapi

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

Step 5: Assign assistant and test

On the phone number you just imported, scroll to Inbound Settings.
Under Select Assistant, choose your Vapi AI assistant.
Click Save.
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.

Troubleshooting

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.

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.

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.

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.

​What you’ll build

​Prerequisites

​Outbound calls

​Inbound calls

​Troubleshooting

​Next steps

What you’ll build

Prerequisites

Outbound calls

Inbound calls

Troubleshooting

Next steps