----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Create Phone Call]() * [Get Call]() * [Outbound Sales Example]() * [List Calls]() -----------------------------

### Answer Hi there, In the context of Vapi's API, the

customerId

is a unique identifier that you, as the developer, assign to each customer to represent them in your system. It's not something that Vapi provides automatically. When you make an outbound call using Vapi's API, you can specify any unique string that identifies the customer in your system as the

customerId

. This ID helps you manage and track calls related to specific customers in your application. You can see this in the structure of the API call for creating a phone call, where

customerId

is one of the parameters you can include in the request payload. Here's an example of how you might structure the request:

json
{
  "customerId": "unique_customer_id_string",
  "customer": {
    "number": "+11234567890",
    "name": "John Doe"
  },
  "phoneNumberId": "your_phone_number_id",
  "assistantId": "your_assistant_id"
}

This format allows you to link the call directly to a customer record in your database. Make sure that the

customerId

is unique and meaningful within your system to avoid conflicts or confusion. If you need further details on how to structure your API requests, you can refer to the documentation on creating phone calls [here]() [(1)]() . I hope this helps! Let me know if you have any more questions. : [Create Phone Call]()

I am using the following JSON as Body { "customer": { "number": "+918437405304", "name": "Vikas Goyal", "extension": "+91" }, "phoneNumberId": "", "metadata": {}, "assistantId": "", "squadId": "1" } but it said { "message": [ "squadId must be a UUID", "phoneNumberId must be a UUID" ], "error": "Bad Request", "statusCode": 400 }

what does it mean by squadId must be UUID and phoenumber must be UUID

what about phoneNumberID

I am using a number that is in my VAPI Dashboard

I got it @Chowderr 👍