> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.vapi.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.vapi.ai/_mcp/server.

# Purchase call concurrency

> Purchase call concurrency from Billing & Add-Ons to increase the number of simultaneous calls available to your Vapi organization. See Vapi pricing for rates.

> **Note**
>
> This page applies if your Dashboard shows **Settings → Billing & Add-Ons**. In this view, each organization has its own subscription and concurrency limit. If your Dashboard sidebar shows **Billing & Payment** instead, see [Manage Success Packages and add-ons](/billing/manage-packages-and-add-ons).

Purchase call concurrency when your organization needs to run more simultaneous calls than its subscription includes.

## How call lines affect concurrency

Call concurrency is the number of Vapi calls that can be active at the same time. Each reserved call line adds one simultaneous call to your organization's included concurrency.

All inbound and outbound calls share the organization's capacity. A campaign's **Max concurrency** setting limits that campaign, but it does not purchase or reserve additional call lines.

## Prerequisites

* An **Admin** role in the organization.
* Enough Vapi credits to cover the prorated charge shown before purchase.

## Purchase call concurrency

#### Open Billing & Add-Ons

Sign in to the [Vapi Dashboard](https://dashboard.vapi.ai), select the organization you want to update, open **Settings**, then select **Billing & Add-Ons**.

#### Enter the reserved concurrency

In **Add-ons**, find **Reserved concurrency (call lines)**. Enter the total number of add-on call lines you want the organization to have.

This value represents purchased call lines, not the organization's total concurrency. For example, if the subscription includes 10 calls and you enter `5`, the organization has 15 call lines after the purchase.

![Reserved concurrency call-line field used to purchase call concurrency in Billing and Add-Ons](/_fern-img/3360884942e48401701cbb7bd296dd783f518c070fb2c52897f6e7bee084d178.webp)

#### Review the pricing preview

Review **Add-ons summary** and **Pricing preview**. The preview shows the new monthly charge and the prorated amount due for the remainder of the current billing period.

#### Confirm the purchase

Select **Purchase add-ons**, review the confirmation dialog, then select **Confirm**. The additional call lines become available after the purchase succeeds.

#### Verify the new capacity

Confirm that **Reserved concurrency (call lines)** shows the purchased amount. The organization's concurrency limit now includes those additional call lines.

## Related

#### [Vapi pricing](https://vapi.ai/pricing)

See current call concurrency and add-on rates on the official pricing page.