When Cap Sales started selling SIP phones, we installed a few systems using Jive. Jive was purchased by GoToConnect (same as GoToMeeting) and really not much has changed. Service is expensive but there is a reoccurring revenue with this service. So we get a discount on our service and also get money from other systems sold. We use Panasonic phones.

Full cloud based system. Simply plug SIP phone into internet anywhere and that extension will act like you are in the office. Full voice tree capabilities and redirecting to cell phones. Pretty simple to use and can update the tree offsite.

Our office is roughly $500 a month for 17 handsets. That includes all numbers and our commission credit. Looks like pricing is on par with Ring Central. Not sure if Ring Central has the ability to be a reseller.