Slack's integration with join.me allows you to instantly start video calls on join.me right from any Slack conversation by typing “/ joinme”.

Your meeting will start right from the chat window, and a link to your meeting and conference number will be sent to all participants in the conversation. When you're done, your visitors can give you feedback right in Slack - and you can even get and share your stats on join.me by typing “/ joinme brag”.