Org Owners and Admins can set any third-party calling apps installed at the org level as options alongside huddles. Other apps can be approved at the org level for Workspace Owners and Admins to install to their workspaces. On the Enterprise Grid plan, certain apps can be installed at the org level. Below Calling options, check the box next to your preferred apps.From your desktop, visit the Slack App Directory and choose a calling app.On the Pro and Business+ plans, Workspace Owners and Admins can select multiple third-party calling apps for members to choose from. Below Calling options, check the box next to your preferred app.Next to Third-party call providers, click Expand.Select Settings & administration from the menu, then click Workspace settings.From your desktop, click your workspace name in the top left.Once you’ve installed an app, use the steps below to make it available in Slack. From your desktop, visit the Slack App Directory and choose a calling app.Enterprise Grid plan Step 1: Select and install a calling app