Cloud PBX, also known as hosted PBX or virtual PBX, is a Private Branch Exchange system that is situated off-site and accessible over a cloud-based IP (Internet Protocol) network. By using a cloud PBX, you can make and receive phone calls via IP phones and softphones installed on your mobile phone or desktop, and the voice traffic is routed via an internet network.
Cloud PBX system is gaining popularity due to the flexibility, simplicity, mobility, and scalability it brings to businesses. Usually, you can buy cloud PBX phone service from a hosted service provider and pay on a regular subscription basis.