They're most basic plan covers up to 10 users, which is perfect for in-office start-ups. Their higher-level plans offer integration applications such as Zendesk and Salesforce. They also offer more features including automatic call reporting and predictive dialer. RingCentral has received a lot of positive feedback regarding its easy to use interface and robust features. They also offer the opportunity to scale up and down as needed with ease.
Voice over IP (VoIP) systems dominate the small to midsized business (SMB) telephone market, and that's only grown stronger during the pandemic. Not just because they're cheaper than an on-premises PBX, but mainly because they're mostly software, which makes them far more flexible. There's nothing an old fashioned PBX can do that a VoIP system can't, but there's a very long list of things you can do with VoIP that just aren't possible using on-premises hardware.

KPIs like the number of voicemails left can be a great indicator of how well even the smallest of changes make a difference in the number of voicemails received. If you decide to speak louder, keep track of the potential increase or decrease to determine if your changes had any effect.
For $69 per agent, per month, you also get abandoned call metrics, holiday routing and service-level monitoring on the Forest plan.