# 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)
---
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