Traditional on-premise PBX systems have a habit of reaching 'end of life' long before the box on the wall actually stops working. Manufacturers stop producing spare parts and formally withdraw support, often years ahead of the hardware becoming physically unusable.
That gap is where the risk sits. A fault on an unsupported system can mean a long search for compatible parts, or an engineer who no longer has access to manufacturer support — both of which turn a small fault into extended downtime.
A hosted VoIP platform sidesteps the problem entirely: there's no ageing on-site cabinet to become obsolete, updates are rolled out centrally, and capacity can flex up or down as the business changes.