Offering more than VoIP business phone services and cloud PBX, RingCentral delivers complete unified communications as a service (UCaaS), which have been engineered to fit seamlessly inside of your current application framework. RingCentral's solutions scale as a business grows, making it a great fit for any size business. Easy to set up phone systems with desktop, desk phone, and mobile app access 15-day free trial to test out the phone system Great call quality on all systems Works via Wi-Fi and cellular data services Unlimited minutes and teleconference calls The quality of RingCentral’s customer service has declined over the past few years, including call center support in foreign countries and long wait times for billing and other issues RingCentral is on the expensive side relative to other services. However, this is balanced out with unlimited minutes for calls from non-toll-free numbers Unlimited phone and conference calls Video conferencing Text messaging iPhone and Android apps Voicemail to email Team collaboration (e.g., file sharing, instant messaging, chat rooms, etc.) Integrations with popular apps (e.g., Microsoft, Google, Dropbox) Team members get access to team messaging through mobile apps Receive traditional phone calls through iOS and Android apps on any mobile device
Their higher-level plans include mobile apps, call recording, an auto-attendant, and outbound predictive dialer, and calling for up to 47 countries. The highest level plan also includes post-call surveys, management analytics, and other features that track employee and company performance. This makes 8x8 a great business phone system for those who want to monitor their company's daily and overall progress.

VoIP or analog: Telephony technology is split between digital phone systems, which send voice calls over the Internet (Voice over IP, or VoIP), and older analog phone systems, which use traditional phone services. Though VoIP phones can call analog phones and vice versa, and there are hybrid systems that contain components of both, it's best for a business that's looking to start from scratch to choose one or the other. The vast majority of businesses are choosing VoIP.
That's the basics of UCaaS, but the concept is constantly evolving to include more communication and collaboration technologies. Those capabilities also get tweaked to provide new benefits, sometimes general, sometimes aimed at specific verticals, like healthcare, for example. The key is integration. Voice is becoming integrated with other back-end apps, and UCaaS is making that easier. In fact, it's become so popular that it's seen rapid growth over the last several years as recent research from Statista bears out.