RichardEarp
10/29/2025, 11:38 AMVapi Support Bot
10/29/2025, 11:39 AMRichardEarp
10/29/2025, 1:20 PMRichardEarp
10/29/2025, 1:25 PMRichardEarp
10/29/2025, 1:41 PMRichardEarp
10/29/2025, 1:58 PMRichardEarp
10/29/2025, 1:59 PMChiranjeet Mishra
11/01/2025, 12:47 AMassistant field to specify a transient assistant or use assistantId for a saved one.
2. **Phone Number**: Use the phoneNumberId of your imported or Vapi-provided number.
3. **Customer**: Pass the customer's number or SIP URI in the customer field.
Here’s a basic example of the JSON payload for a call:
json
{
"assistantId": "assistant-id",
"phoneNumberId": "phone-number-id",
"customer": {
"number": "+11231231234"
}
}
For scheduling calls, you can use the schedulePlan parameter with earliestAt and latestAt fields:
json
{
"assistantId": "assistant-id",
"phoneNumberId": "phone-number-id",
"customer": {
"number": "+11231231234"
},
"schedulePlan": {
"earliestAt": "2025-05-30T00:00:00Z"
}
}
For more details, you can refer to the [Outbound Calling documentation](https://docs.vapi.ai/calls/outbound-calling).