On-premise telephone hardware becomes obsolete and out-of-date, resulting in high out-of-pocket expenses to purchase new systems which will also become obsolete and out-of-date.
With a cloud hosted PBX, there's no need to switch out hardware or rearrange your infrastructure. Virtually the entire system can be administered through remote technical support.
You get control and flexibility of your system, with all of the benefits of an enterprise-grade telephony system but without the cost, worry, or hassle.