I run a consultancy of about 15 including myself. We use a combo of Ventrilo (http://ventrilo.com http://ventrilo.com) and Slack. I'd make a bet that our produc

I run a consultancy of about 15 including myself. We use a combo of Ventrilo (http://ventrilo.com http://ventrilo.com) and Slack. I'd make a bet that our productivity and communication is better than 99% of any company. Alternatives to Ventrilo (just my personal preference, really), includes Mumble and Teamspeak. Everyone is required to have a push-to-talk key, too. We give everyone their own office (a la dedicated channel for them), and have some scripts built into that allow us to page another user and tell them we need their attention.