We use Fuze as our primary phone system. Fuze is integrated with our desk phones, our computers, and our mobile devices. I can place a call with one click through any of these devices. It also integrates with our email and outreach software such as Outreach and Salesforce. On the sales team it saves us a ton of time not having to dial numbers.
It's perfect for the modern office where all your hardware devices need to be connected for a single, seamless experience. I would not recommend it without a strong IT team to make sure all the integrations are set up appropriately.