There are two types of ring groups that businesses commonly use, here at Fonality we call them "hunt groups" and "blast groups". Hunt groups allow you to set phones to ring consecutively, controlling the order and the ring time of each phone individually. Blast groups allow you to ring phones concurrently controlling the ring time of the group as a whole, as well as determining whether or not the customer will hear music or rining while waiting.
Below you will find two articles that explain these two functions and how to use them.