# Triggering an outbound SMS Virtual Agent

You can jumpstart the outbound session from any platform of your choosing, e.g. Postman. 

{% hint style="warning" %}
**Are you within the limits?**

*Studio’s outbound call limits that is! We currently only allow one session per second however if your virtual agent needs to make more calls we can increase the limit up to 5 outbound sessions per second.* 

*If you require an increased limit, please email* [*<mark style="color:purple;">support@aistudio.vonage.com</mark>*](mailto:support@aistudio.vonage.com) *with the following details:-*

* *API key*&#x20;
* *Agent ID(/s)*
* *Increase request: You can choose to increase your limit to 3 or 5 sessions per second* &#x20;

*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 sessions.*

*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 %}

The query will look like the following -&#x20;

#### Endpoint (mandatory)

The endpoint depends on the region you selected for your agent

For EU agents --> `https://studio-api-eu.ai.vonage.com/messaging/conversation`

For US agents --> `https://studio-api-us.ai.vonage.com/messaging/conversation`

#### Method (mandatory)

POST

#### Headers (mandatory)

`X-Vgai-Key`

{% 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 %}

#### Request Body

```
{ 
    "to": "TO_NUMBER", 
    "agent_id": "AGENT_ID", 
    "channel": "sms",
    "status_url": "string",
    "session_parameters": [
    {
      "name": "string",
      "value": "string"
    }
  ]
}
```

{% hint style="info" %}
*If you want to create an outbound campaign sending a multitude of messages to different recipients at the same time, please* [*<mark style="color:purple;">contact our support team</mark>*](https://api.support.vonage.com/hc/en-us/requests/new) *for help*.&#x20;
{% endhint %}