# Deployment

> Connect a phone number from a SIP provider or your own Twilio account, then configure inbound or outbound calls for a flow with voice agents.

## Prerequisites

| Prerequisite | Needed for |
| --- | --- |
| A [Flow](https://docs.uipath.com/maestro/automation-cloud/latest/user-guide/conversational-voice) with a **Voice agent** node and an incoming or outgoing call node | Always |
| A [serverless robot machine template](https://docs.uipath.com/orchestrator/automation-cloud/latest/user-guide/executing-unattended-automations-with-serverless-robots#step-2-adding-serverless-robots-to-your-tenant) and an [unattended robot account](https://docs.uipath.com/orchestrator/automation-cloud/latest/user-guide/executing-unattended-automations-with-serverless-robots#step-1-enabling-unattended-automation-on-an-account) in the Orchestrator folder | Always |
| The Flow [published and deployed](https://docs.uipath.com/maestro/automation-cloud/latest/user-guide/deploying-a-flow) | Always |
| The [**Conversational Agents App**](#register-the-conversational-agents-app) registered in your organization | Inbound calls |

## Phone-call setup

Connecting a number, authorizing your provider, and binding the number to a Flow all happen on your provider's page.

| Your number lives | Follow |
| --- | --- |
| On a SIP trunk | [Any SIP provider](./conversational-agents-voice-sip.md#before-you-start) |
| On your own Twilio account | [Twilio](./conversational-agents-voice-twilio.md) |

## Register the Conversational Agents App

An inbound call carries no UiPath user identity. It runs under the **Conversational Agents App**, which must be registered before the call can reach your Flow's Orchestrator folder. Register it once per organization, as an organization administrator.

1. Go to **Admin** and select your organization at the top of the left panel.
2. Select **External applications**.

   ![The Admin landing page, with the External applications tile in the third row](https://dev-assets.cms.uipath.com/assets/images/agents/voice-admin-external-applications-45dc7388.webp)
3. Open the **App registrations** tab.
4. Under **Available applications**, find the **Conversational Agents App** card, then select **Register**.

![The App registrations tab, showing Conversational Agents App under Registered applications](https://dev-assets.cms.uipath.com/assets/images/agents/voice-app-registrations-23cb8135.webp)