AdaptiveCardsJson - Click to call option without opening new URL - json

Question

I've got a Json AdaptiveCard that presents information on employees in the business with their name, job title, phone number, email etc..
We've set it up to dial their telephone number on a click to call, but clicking the number opens up a new URL which we don't want. We want it as a background action.
How can we achieve this? Here's our code (Look at the section that has FaceSet, then a Telephone value, it's that value that creates the click to call:
{
"$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
"type": "AdaptiveCard",
"version": "1.0",
"actions": [
{
"type": "Action.OpenUrl",
"title": "Call",
"url": "dial:{{Phone}}"
}
],
"body": [
{
"type": "ColumnSet",
"columns": [
{
"type": "Column",
"width": "auto",
"items": [
{
"type": "Image",
"url": "http://intranet.christiegroup.com/stafflisting/staff/{{Reference}}.jpg",
"size": "medium",
"style": "people"
}
]
},
{
"type": "Column",
"width": "stretch",
"items": [
{
"type": "TextBlock",
"text": "{{FullName}}",
"weight": "bolder",
"wrap": true
},
{
"type": "TextBlock",
"spacing": "none",
"text": "{{JobTitle}}",
"isSubtle": true,
"wrap": true
},
{
"type": "FactSet",
"facts": [
{
"title": "Telephone:",
"value": "[{{Phone}}](dial:{{Phone}})"
},
{
"title": "Mobile:",
"value": "{{Mobile}}"
},
{
"title": "Email:",
"value": "{{Email}}"
}
]
}
]
}
]
}
]
}