----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Setting Server URLs]() * [Update Phone Number]() * [List Phone Numbers]() * [Import Vonage Number]() -----------------------------

### Answer You can attach a server URL to a phone number in Vapi through three main methods: 1. **At the Time of Purchase**: When you buy a phone number through Vapi, you can specify the server URL during the purchase process. 2. **At Import**: When you import a phone number from Twilio or Vonage, you have the option to set a server URL. 3. **Via Update**: You can update a phone number already in your account to include a server URL. Here’s how you can update a server URL for an existing phone number using the API:

curl
curl --request PATCH \
  --url https://api.vapi.ai/phone-number/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "serverUrl": "<your_server_url>"
}'

This command updates the server URL for the specified phone number. Make sure to replace

{id}

with the actual ID of the phone number and

<your_server_url>

with the URL you want to set [(1)]() . For more details on how to set server URLs at different levels in Vapi, you can refer to the documentation on setting server URLs [(2)]() .