Nextiva is the best conference calling solution for most businesses. It’s incredibly reliable and has carrier-grade data centers to ensure the highest possible call quality. Nextiva’s mobile app makes it easy to manage your phone system on the go—meaning you can join or host a conference call from anywhere.  With Nextiva, you’ll also have access to video conference calls in addition to traditional voice calling. Nextiva’s Professional plan supports audio and video conference calls with up to 40 participants, and the Enterprise plan allows for unlimited conference call participants.