Phone System - http://www.ringcentral.com/office/phone-system-features.html?bmid=seo

The video is all about how you can get the right phone system for your business.

If you want at least 4 of your employees to be on the phone all at the same time, then a 4 line phone system (http://www.ringcentral.com/office/phone-system-features.html) would be the perfect choice for your business, especially if you're merely a start-up.