## Calling

Voice calling via the dialer is not provided by the Project Blue API. Outbound and inbound calls are handled by **Twilio**. We give you a Twilio API key in the webapp so you can build calling yourself.

FaceTime Audio calls **are** provided natively by the Project Blue API — see [FaceTime Audio](https://api.tryprojectblue.com/#facetime) above.

Your **Twilio API key** is already created for you. You don't add phone numbers or caller ID — our team provides those.

### Getting your Twilio API key

You must be on an **API** or **Zapier** based account.

In the Project Blue portal, go to **Settings** → **API Keys**. Your Twilio API key is exposed there.

![Twilio API key in Project Blue Settings → API Keys](https://api.tryprojectblue.com/pb-app/pb_twilio_webhook.png)

[Use Twilio's Voice API documentation](https://www.twilio.com/docs/voice) to implement outbound and inbound calls.

> SMS, iMessage, and MMS stay on the Project Blue API. Only voice calling uses your Twilio key and Twilio's API.