@MoonCactus you can use Jitsi… GitHub - mattermost-community/mattermost-plugin-jitsi: Jitsi plugin for Mattermost 🔌
And you’re correct, there were restrictions put around Calls fairly recently. I think it was the ability to do calls in channels, or in group DMs with over a certain number of participants. v10 changelog - Mattermost documentation tells us for version 10.0:
Pre-packaged Calls plugin v1.0.1. This includes breaking changes including removal of group calls from unlicensed servers in order to focus supportability and quality on licensed servers. Unlicensed servers can continue to use Calls in direct message channels, which represent the majority of activity.