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While Slack ... to the audio calls, which are just a bit more formal). Unfortunately, they are only available if you have a paid account. If you do, it’s very simple to start a Huddle.

Slack Huddles is a ... users can now hop on a quick call to solve problems, brainstorm or catch up in a less formal way. You can have up to 50 people in a Huddle, and you can invite people from ...