> For the complete documentation index, see [llms.txt](https://studio.docs.ai.vonage.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://studio.docs.ai.vonage.com/voice/get-started/sending-an-outbound-call-request-via-postman.md).
# Sending an Outbound Call Request via Postman
{% hint style="danger" %}
**Are you using postman?**
*When using curly braces in the query parameters, make sure you encode the content of your curly braces. If sent without the encoding, your request will return empty*.
{% endhint %}
{% hint style="warning" %}
**Are you within the limits?**
*Studio’s outbound call limits that is! We currently only allow one call/session per second however if your virtual agent needs to make more calls we can increase the limit up to 5 outbound calls per second.*
*If you require an increased limit, please email* [*support@aistudio.vonage.com*](mailto:support@aistudio.vonage.com) *with the following details:-*
* *API key*
* *Agent ID(/s)*
* *Increase request: You can choose to increase your limit to 3 or 5 calls per second*
*Once you receive confirmation from our teams that your request has been processed, please publish your agents and wait for about 5 minutes before you start triggering any new outbound calls.*
*Please note that if your agent is not approved for a higher limit, any call made over the 1 call per second limit will fail and return a 429 error!*
{% endhint %}
## Step by Step
1. Start adding `POST` as the type of the API request.
2\. Add the endpoint based on agent region
**EU** region --> [`https://studio-api-eu.ai.vonage.com/telephony/make-call`](https://studio-api-eu.ai.vonage.com/telephony/make-call)
**US** region --> [`https://studio-api-us.ai.vonage.com/telephony/make-call` ]()
3\. Continue with the headers --> `X-Vgai Key` (Don't forget to add the value of the `Vgai key` after you generated it)
{% hint style="info" %}
*You can find the* `X-Vgai-Key` *on the top right of your canvas. Click on the "user" icon, and then "Generate API Key".*
{% endhint %}
4\. Then add the BODY of the request. Make sure your body tag is set as JSON. Learn more about syntax [here.](https://studio.docs.ai.vonage.com/voice/get-started/telephony#how-to-prepare-your-outbound-call-query)
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://studio.docs.ai.vonage.com/voice/get-started/sending-an-outbound-call-request-via-postman.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.