VAPI•4mo ago

Create Phone Number API Request Error

Create Phone Number API Request returns no phone number and is inaccessible on dashboard without errors(see image)

I get this error when trying to even view the created number in dashboard:
Error: TypeError

Message: A phone number must either be a string or an object of shape { phone, [country] }.

Timestamp: 2025-09-05T14:37:59.951Z

I can get the phone fine with the API but once again it has no phone number.
When creating phone number my body contains only: {provider: "vapi"}

aware-amethyst•9/5/25, 2:59 PM

Have you tried it creating using Dashboard

hurt-tomatoOP•9/5/25, 3:00 PM

It works perfect via dashboard but my Saas requires the ability to create assistants, create phone numbers, and auto-attatch them to the assistants.

VapiAPP•9/8/25, 2:35 PM

Hi Mornz,

To create a phone number using the API, make a POST request to https://api.vapi.ai/phone-numberhttps://api.vapi.ai/phone-number with the necessary headers and data. Here's a sample cURL command for creating a phone number:

curl -X POST https://api.vapi.ai/phone-number \
     -H "Authorization: Bearer <token>" \
     -H "Content-Type: application/json" \
     -d '{
  "provider": "byo-phone-number",
  "credentialId": "string"
}'

curl -X POST https://api.vapi.ai/phone-number \
     -H "Authorization: Bearer <token>" \
     -H "Content-Type: application/json" \
     -d '{
  "provider": "byo-phone-number",
  "credentialId": "string"
}'

Ensure you replace <token><token> with your actual authentication token and fill in the required fields such as

credentialId

credentialId

. For more details, you can refer to the Create Phone Number documentation.

Ccomprehensive-tomato Hi Mornz, To create a phone number using the API, make a POST request to `https...

hurt-tomatoOP•9/8/25, 10:48 PM

my request looks like this, it still does not work.:
curl -X POST https://api.vapi.ai/phone-number \
-H "Authorization: Bearer <token>" \
-H "Content-Type: application/json" \
-d '{
"provider": "vapi",
}'

VapiAPP•9/10/25, 7:13 PM

You will also need the credentialId from the SIP Trunk creation. Without the SIP Trunk association, you will not be able to create a phone number through the API

curl -X POST https://api.vapi.ai/phone-number \ -H "Authorization: Bearer <token>" \ -H "Content-Type: application/json" \ -d '{ "provider": "byo-phone-number", "credentialId": "string" }'

Create Phone Number API Request Error

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