Do your homework before you switch to RingCentral.
BEWARE! They have non existent customer service. The account managers have no clue how to help. They repeatedly apologize but can never seem to solve a problem. I was billed for a number I did not have or use. To this day I have not been able to have the number canceled or receive a credit for the payments they deducted from my credit card. They advertise HD Voice. I believe that's just the product name they use. I have experienced terrible voice quality. Many times incoming calls are interrupted and you have to wait for the call to reconnect. I usually end up calling from another line. They are way overpriced for the product and service they deliver. Look for other options. I can't wait to move my numbers elsewhere.