Typically, hosted VoIP means a Voice over IP (VoIP) service for businesses that is provided by an outside company. Hosting is usually in colocation (multiple companies using one facility) data centers. VirtualPBX offers six redundant servers across the US and EU. People using these services should make sure that the data centers have sufficient power, connectivity, and redundancy to provide high availability.

Hosted VoIP phone services for businesses include both the ability to make and receive calls over the internet and the ancillary telephony services that are needed for business use, these VirtualPBX features include voicemail, call routing, virtual attendant, etc. Administration for VoIP business phone systems is usually provided through web browsers.